How to draw (maybe curved) electrical field lines between two plates in TikZ












3















How to draw these figures in TikZ?



enter image description here



I have managed to draw the first two figures, but the way I drew the arrows is not really good:



documentclass[tikz,border=3mm]{standalone} 
begin{document}
begin{tikzpicture}
foreach i in {-3,...,3}
draw[->] (i,0)--(i,-1.1); % Figure A
%draw[-<] (i,0)--(i,-1.1); Figure B
draw (-3,-1)--(-3,-2.2);
draw (-2,-1)--(-2,-2.4);
draw (-1,-1)--(-1,-2.6);
draw (0,-1)--(0,-2.7);
draw (3,-1)--(3,-2.2);
draw (2,-1)--(2,-2.4);
draw (1,-1)--(1,-2.6);
% It is ugly and time-consuming, right? but I can't find a better one
draw[line width=3pt,red] (-3.5,0)--(3.5,0);
draw (0,0) node[above] {$+$};
draw[line width=3pt,blue] (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
draw (0,-2.7) node[below] {$-$};
end{tikzpicture}
end{document}


enter image description here



As the way I drew the straight arrows is not optimal, I can't use it to draw the curved arrows in the last two figures.



Can you show me a better way? Thank you in advance.










share|improve this question







New contributor




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  • Draw the blue curve as an arc so you can predict the coordinates of points on it. And then draw arrows by [bend = xxxx].

    – Symbol 1
    1 hour ago
















3















How to draw these figures in TikZ?



enter image description here



I have managed to draw the first two figures, but the way I drew the arrows is not really good:



documentclass[tikz,border=3mm]{standalone} 
begin{document}
begin{tikzpicture}
foreach i in {-3,...,3}
draw[->] (i,0)--(i,-1.1); % Figure A
%draw[-<] (i,0)--(i,-1.1); Figure B
draw (-3,-1)--(-3,-2.2);
draw (-2,-1)--(-2,-2.4);
draw (-1,-1)--(-1,-2.6);
draw (0,-1)--(0,-2.7);
draw (3,-1)--(3,-2.2);
draw (2,-1)--(2,-2.4);
draw (1,-1)--(1,-2.6);
% It is ugly and time-consuming, right? but I can't find a better one
draw[line width=3pt,red] (-3.5,0)--(3.5,0);
draw (0,0) node[above] {$+$};
draw[line width=3pt,blue] (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
draw (0,-2.7) node[below] {$-$};
end{tikzpicture}
end{document}


enter image description here



As the way I drew the straight arrows is not optimal, I can't use it to draw the curved arrows in the last two figures.



Can you show me a better way? Thank you in advance.










share|improve this question







New contributor




Someone is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.





















  • Draw the blue curve as an arc so you can predict the coordinates of points on it. And then draw arrows by [bend = xxxx].

    – Symbol 1
    1 hour ago














3












3








3


0






How to draw these figures in TikZ?



enter image description here



I have managed to draw the first two figures, but the way I drew the arrows is not really good:



documentclass[tikz,border=3mm]{standalone} 
begin{document}
begin{tikzpicture}
foreach i in {-3,...,3}
draw[->] (i,0)--(i,-1.1); % Figure A
%draw[-<] (i,0)--(i,-1.1); Figure B
draw (-3,-1)--(-3,-2.2);
draw (-2,-1)--(-2,-2.4);
draw (-1,-1)--(-1,-2.6);
draw (0,-1)--(0,-2.7);
draw (3,-1)--(3,-2.2);
draw (2,-1)--(2,-2.4);
draw (1,-1)--(1,-2.6);
% It is ugly and time-consuming, right? but I can't find a better one
draw[line width=3pt,red] (-3.5,0)--(3.5,0);
draw (0,0) node[above] {$+$};
draw[line width=3pt,blue] (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
draw (0,-2.7) node[below] {$-$};
end{tikzpicture}
end{document}


enter image description here



As the way I drew the straight arrows is not optimal, I can't use it to draw the curved arrows in the last two figures.



Can you show me a better way? Thank you in advance.










share|improve this question







New contributor




Someone is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.












How to draw these figures in TikZ?



enter image description here



I have managed to draw the first two figures, but the way I drew the arrows is not really good:



documentclass[tikz,border=3mm]{standalone} 
begin{document}
begin{tikzpicture}
foreach i in {-3,...,3}
draw[->] (i,0)--(i,-1.1); % Figure A
%draw[-<] (i,0)--(i,-1.1); Figure B
draw (-3,-1)--(-3,-2.2);
draw (-2,-1)--(-2,-2.4);
draw (-1,-1)--(-1,-2.6);
draw (0,-1)--(0,-2.7);
draw (3,-1)--(3,-2.2);
draw (2,-1)--(2,-2.4);
draw (1,-1)--(1,-2.6);
% It is ugly and time-consuming, right? but I can't find a better one
draw[line width=3pt,red] (-3.5,0)--(3.5,0);
draw (0,0) node[above] {$+$};
draw[line width=3pt,blue] (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
draw (0,-2.7) node[below] {$-$};
end{tikzpicture}
end{document}


enter image description here



As the way I drew the straight arrows is not optimal, I can't use it to draw the curved arrows in the last two figures.



Can you show me a better way? Thank you in advance.







tikz-pgf arrows






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New contributor




Someone is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.











share|improve this question







New contributor




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Check out our Code of Conduct.









share|improve this question




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asked 2 hours ago









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Check out our Code of Conduct.






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Check out our Code of Conduct.













  • Draw the blue curve as an arc so you can predict the coordinates of points on it. And then draw arrows by [bend = xxxx].

    – Symbol 1
    1 hour ago



















  • Draw the blue curve as an arc so you can predict the coordinates of points on it. And then draw arrows by [bend = xxxx].

    – Symbol 1
    1 hour ago

















Draw the blue curve as an arc so you can predict the coordinates of points on it. And then draw arrows by [bend = xxxx].

– Symbol 1
1 hour ago





Draw the blue curve as an arc so you can predict the coordinates of points on it. And then draw arrows by [bend = xxxx].

– Symbol 1
1 hour ago










2 Answers
2






active

oldest

votes


















2














An alternative, but very similar, approach to marmot's excellent solution (beaten by mere minutes).



documentclass[tikz,border=3mm]{standalone}
begin{document}
begin{tikzpicture}
% Library for middle arrowheads
usetikzlibrary{decorations.markings}

% Style the vertical lines (this form is necessary for the middle arrowhead)
begin{scope}[semithick,decoration={
markings,
mark=at position 0.4 with {arrow{>}}}
]
% Loop through and draw each vertical line
foreach xRed in {-3,...,3}
% Spread the bottom points horizontally
pgfmathsetmacroxBlue{xRed*1.1}
% Red line is straight, but could put arbitrary function here
pgfmathsetmacroyRed{0}
% Blue line is curved, quadratic eqn
pgfmathsetmacroyBlue{0.06*xBlue*xBlue-2.7}
% Calculate angle of lines touching blue line
pgfmathsetmacroangle{6.6667*xRed+90}
% Draw a line
draw[postaction={decorate}] (xRed,yRed) to[out=-90,in=angle] (xBlue,yBlue);
end{scope}

% Red line, could put arbitrary function here
draw[domain=-3.5:3.5,smooth,variable=x,line width=3pt,red] plot ({x},{0});
% + sign
draw (0,0) node[above] {(+)};

% Blue line, quadratic eqn
draw[domain=-3.5:3.5,smooth,variable=x,line width=3pt,blue] plot ({x},{0.06*x*x-2.7});
% - sign
draw (0,-2.7) node[below] {(-)};

end{tikzpicture}
end{document}


Final result






share|improve this answer








New contributor




Robin Georg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
Check out our Code of Conduct.




























    1














    Welcome to TeX.SE! decoration.markings and foreach can help a lot here. The arrows in the middle are (essentially) from here. And decorations.markings is also used to set marks along the blue curves. They get used to define the starting points of the arrows. The to[out=...,int=...] is used to bend the paths in C and D.



    documentclass[tikz,border=3mm]{standalone} 
    usetikzlibrary{decorations.markings,arrows.meta}
    tikzset{->-/.style={postaction={decorate,decoration={
    markings,
    mark=at position #1 with {arrow[arsty]{>}}}}},
    -<-/.style={postaction={decorate,decoration={
    markings,
    mark=at position #1 with {arrow[arsty]{<}}}}},
    insert target/.style args={#1|#2}{postaction={decorate,decoration={
    markings,
    mark=at position #1 with {coordinate (target-#2);}}}}
    }
    begin{document}
    begin{tikzpicture}[arsty/.style={},>=Latex,font=sffamily]
    begin{scope}[local bounding box=A]
    draw[line width=3pt,red,
    %insert target/.list={1/12|Atop-1,3/12|Atop-2,5/12|Atop-3,7/12|Atop-4,9/12|Atop-5,11/12|Atop-6}
    ] (-3.5,0)--(3.5,0);
    draw (0,0) node[above] {$+$};
    draw[line width=3pt,blue,
    insert target/.list={1/12|Abot-1,3/12|Abot-2,5/12|Abot-3,7/12|Abot-4,9/12|Abot-5,11/12|Abot-6}] (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
    foreach X in {1,...,6}
    {draw[-<-=0.5] (target-Abot-X) -- (0,0-|target-Abot-X);}
    draw (0,-2.7) node[below] {$-$};
    end{scope}
    node[anchor=south] at (A.north) {A};
    %
    begin{scope}[local bounding box=B,xshift=8cm]
    draw[line width=3pt,red,
    %insert target/.list={1/12|Btop-1,3/12|Btop-2,5/12|Btop-3,7/12|Btop-4,9/12|Btop-5,11/12|Btop-6}
    ] (-3.5,0)--(3.5,0);
    draw (0,0) node[above] {$+$};
    draw[line width=3pt,blue,
    insert target/.list={1/12|Bbot-1,3/12|Bbot-2,5/12|Bbot-3,7/12|Bbot-4,9/12|Bbot-5,11/12|Bbot-6}] (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
    foreach X in {1,...,6}
    {draw[->-=0.5] (target-Bbot-X) -- (0,0-|target-Bbot-X);}
    draw (0,-2.7) node[below] {$-$};
    end{scope}
    node[anchor=south] at (B.north) {B};
    %
    begin{scope}[local bounding box=C,yshift=-6cm]
    draw[line width=3pt,red,
    %insert target/.list={1/12|Ctop-1,3/12|Ctop-2,5/12|Ctop-3,7/12|Ctop-4,9/12|Ctop-5,11/12|Ctop-6}
    ] (-3.5,0)--(3.5,0);
    draw (0,0) node[above] {$+$};
    draw[line width=3pt,blue,
    insert target/.list={1/12|Cbot-1,3/12|Cbot-2,5/12|Cbot-3,7/12|Cbot-4,9/12|Cbot-5,11/12|Cbot-6}]
    (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
    foreach X in {1,...,6}
    {draw[-<-=0.5] (target-Cbot-X) to[out=69+6*X,in=-90]
    ([xshift={(3.5-X)*1.3mm}]target-Cbot-X |-0,0);
    }
    draw (0,-2.7) node[below] {$-$};
    end{scope}
    node[anchor=south] at (C.north) {C};
    %
    begin{scope}[local bounding box=D,xshift=8cm,yshift=-6cm]
    draw[line width=3pt,red,
    insert target/.list={1/12|Dtop-1,3/12|Dtop-2,5/12|Dtop-3,7/12|Dtop-4,9/12|Dtop-5,11/12|Dtop-6}] (-3.5,0)--(3.5,0);
    draw (0,0) node[above] {$+$};
    draw[line width=3pt,blue,
    insert target/.list={1/12|Dbot-1,3/12|Dbot-2,5/12|Dbot-3,7/12|Dbot-4,9/12|Dbot-5,11/12|Dbot-6}] (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
    foreach X in {1,...,6}
    {draw[->-=0.5] (target-Dbot-X) to[out=69+6*X,in=-90]
    ([xshift={(3.5-X)*1.3mm}]target-Dbot-X |-0,0);
    }
    draw (0,-2.7) node[below] {$-$};
    end{scope}
    node[anchor=south] at (D.north) {D};
    end{tikzpicture}
    end{document}


    enter image description here






    share|improve this answer























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      2 Answers
      2






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      2 Answers
      2






      active

      oldest

      votes









      active

      oldest

      votes






      active

      oldest

      votes









      2














      An alternative, but very similar, approach to marmot's excellent solution (beaten by mere minutes).



      documentclass[tikz,border=3mm]{standalone}
      begin{document}
      begin{tikzpicture}
      % Library for middle arrowheads
      usetikzlibrary{decorations.markings}

      % Style the vertical lines (this form is necessary for the middle arrowhead)
      begin{scope}[semithick,decoration={
      markings,
      mark=at position 0.4 with {arrow{>}}}
      ]
      % Loop through and draw each vertical line
      foreach xRed in {-3,...,3}
      % Spread the bottom points horizontally
      pgfmathsetmacroxBlue{xRed*1.1}
      % Red line is straight, but could put arbitrary function here
      pgfmathsetmacroyRed{0}
      % Blue line is curved, quadratic eqn
      pgfmathsetmacroyBlue{0.06*xBlue*xBlue-2.7}
      % Calculate angle of lines touching blue line
      pgfmathsetmacroangle{6.6667*xRed+90}
      % Draw a line
      draw[postaction={decorate}] (xRed,yRed) to[out=-90,in=angle] (xBlue,yBlue);
      end{scope}

      % Red line, could put arbitrary function here
      draw[domain=-3.5:3.5,smooth,variable=x,line width=3pt,red] plot ({x},{0});
      % + sign
      draw (0,0) node[above] {(+)};

      % Blue line, quadratic eqn
      draw[domain=-3.5:3.5,smooth,variable=x,line width=3pt,blue] plot ({x},{0.06*x*x-2.7});
      % - sign
      draw (0,-2.7) node[below] {(-)};

      end{tikzpicture}
      end{document}


      Final result






      share|improve this answer








      New contributor




      Robin Georg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
      Check out our Code of Conduct.

























        2














        An alternative, but very similar, approach to marmot's excellent solution (beaten by mere minutes).



        documentclass[tikz,border=3mm]{standalone}
        begin{document}
        begin{tikzpicture}
        % Library for middle arrowheads
        usetikzlibrary{decorations.markings}

        % Style the vertical lines (this form is necessary for the middle arrowhead)
        begin{scope}[semithick,decoration={
        markings,
        mark=at position 0.4 with {arrow{>}}}
        ]
        % Loop through and draw each vertical line
        foreach xRed in {-3,...,3}
        % Spread the bottom points horizontally
        pgfmathsetmacroxBlue{xRed*1.1}
        % Red line is straight, but could put arbitrary function here
        pgfmathsetmacroyRed{0}
        % Blue line is curved, quadratic eqn
        pgfmathsetmacroyBlue{0.06*xBlue*xBlue-2.7}
        % Calculate angle of lines touching blue line
        pgfmathsetmacroangle{6.6667*xRed+90}
        % Draw a line
        draw[postaction={decorate}] (xRed,yRed) to[out=-90,in=angle] (xBlue,yBlue);
        end{scope}

        % Red line, could put arbitrary function here
        draw[domain=-3.5:3.5,smooth,variable=x,line width=3pt,red] plot ({x},{0});
        % + sign
        draw (0,0) node[above] {(+)};

        % Blue line, quadratic eqn
        draw[domain=-3.5:3.5,smooth,variable=x,line width=3pt,blue] plot ({x},{0.06*x*x-2.7});
        % - sign
        draw (0,-2.7) node[below] {(-)};

        end{tikzpicture}
        end{document}


        Final result






        share|improve this answer








        New contributor




        Robin Georg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
        Check out our Code of Conduct.























          2












          2








          2







          An alternative, but very similar, approach to marmot's excellent solution (beaten by mere minutes).



          documentclass[tikz,border=3mm]{standalone}
          begin{document}
          begin{tikzpicture}
          % Library for middle arrowheads
          usetikzlibrary{decorations.markings}

          % Style the vertical lines (this form is necessary for the middle arrowhead)
          begin{scope}[semithick,decoration={
          markings,
          mark=at position 0.4 with {arrow{>}}}
          ]
          % Loop through and draw each vertical line
          foreach xRed in {-3,...,3}
          % Spread the bottom points horizontally
          pgfmathsetmacroxBlue{xRed*1.1}
          % Red line is straight, but could put arbitrary function here
          pgfmathsetmacroyRed{0}
          % Blue line is curved, quadratic eqn
          pgfmathsetmacroyBlue{0.06*xBlue*xBlue-2.7}
          % Calculate angle of lines touching blue line
          pgfmathsetmacroangle{6.6667*xRed+90}
          % Draw a line
          draw[postaction={decorate}] (xRed,yRed) to[out=-90,in=angle] (xBlue,yBlue);
          end{scope}

          % Red line, could put arbitrary function here
          draw[domain=-3.5:3.5,smooth,variable=x,line width=3pt,red] plot ({x},{0});
          % + sign
          draw (0,0) node[above] {(+)};

          % Blue line, quadratic eqn
          draw[domain=-3.5:3.5,smooth,variable=x,line width=3pt,blue] plot ({x},{0.06*x*x-2.7});
          % - sign
          draw (0,-2.7) node[below] {(-)};

          end{tikzpicture}
          end{document}


          Final result






          share|improve this answer








          New contributor




          Robin Georg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.










          An alternative, but very similar, approach to marmot's excellent solution (beaten by mere minutes).



          documentclass[tikz,border=3mm]{standalone}
          begin{document}
          begin{tikzpicture}
          % Library for middle arrowheads
          usetikzlibrary{decorations.markings}

          % Style the vertical lines (this form is necessary for the middle arrowhead)
          begin{scope}[semithick,decoration={
          markings,
          mark=at position 0.4 with {arrow{>}}}
          ]
          % Loop through and draw each vertical line
          foreach xRed in {-3,...,3}
          % Spread the bottom points horizontally
          pgfmathsetmacroxBlue{xRed*1.1}
          % Red line is straight, but could put arbitrary function here
          pgfmathsetmacroyRed{0}
          % Blue line is curved, quadratic eqn
          pgfmathsetmacroyBlue{0.06*xBlue*xBlue-2.7}
          % Calculate angle of lines touching blue line
          pgfmathsetmacroangle{6.6667*xRed+90}
          % Draw a line
          draw[postaction={decorate}] (xRed,yRed) to[out=-90,in=angle] (xBlue,yBlue);
          end{scope}

          % Red line, could put arbitrary function here
          draw[domain=-3.5:3.5,smooth,variable=x,line width=3pt,red] plot ({x},{0});
          % + sign
          draw (0,0) node[above] {(+)};

          % Blue line, quadratic eqn
          draw[domain=-3.5:3.5,smooth,variable=x,line width=3pt,blue] plot ({x},{0.06*x*x-2.7});
          % - sign
          draw (0,-2.7) node[below] {(-)};

          end{tikzpicture}
          end{document}


          Final result







          share|improve this answer








          New contributor




          Robin Georg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.









          share|improve this answer



          share|improve this answer






          New contributor




          Robin Georg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.









          answered 30 mins ago









          Robin GeorgRobin Georg

          211




          211




          New contributor




          Robin Georg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.





          New contributor





          Robin Georg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.






          Robin Georg is a new contributor to this site. Take care in asking for clarification, commenting, and answering.
          Check out our Code of Conduct.























              1














              Welcome to TeX.SE! decoration.markings and foreach can help a lot here. The arrows in the middle are (essentially) from here. And decorations.markings is also used to set marks along the blue curves. They get used to define the starting points of the arrows. The to[out=...,int=...] is used to bend the paths in C and D.



              documentclass[tikz,border=3mm]{standalone} 
              usetikzlibrary{decorations.markings,arrows.meta}
              tikzset{->-/.style={postaction={decorate,decoration={
              markings,
              mark=at position #1 with {arrow[arsty]{>}}}}},
              -<-/.style={postaction={decorate,decoration={
              markings,
              mark=at position #1 with {arrow[arsty]{<}}}}},
              insert target/.style args={#1|#2}{postaction={decorate,decoration={
              markings,
              mark=at position #1 with {coordinate (target-#2);}}}}
              }
              begin{document}
              begin{tikzpicture}[arsty/.style={},>=Latex,font=sffamily]
              begin{scope}[local bounding box=A]
              draw[line width=3pt,red,
              %insert target/.list={1/12|Atop-1,3/12|Atop-2,5/12|Atop-3,7/12|Atop-4,9/12|Atop-5,11/12|Atop-6}
              ] (-3.5,0)--(3.5,0);
              draw (0,0) node[above] {$+$};
              draw[line width=3pt,blue,
              insert target/.list={1/12|Abot-1,3/12|Abot-2,5/12|Abot-3,7/12|Abot-4,9/12|Abot-5,11/12|Abot-6}] (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
              foreach X in {1,...,6}
              {draw[-<-=0.5] (target-Abot-X) -- (0,0-|target-Abot-X);}
              draw (0,-2.7) node[below] {$-$};
              end{scope}
              node[anchor=south] at (A.north) {A};
              %
              begin{scope}[local bounding box=B,xshift=8cm]
              draw[line width=3pt,red,
              %insert target/.list={1/12|Btop-1,3/12|Btop-2,5/12|Btop-3,7/12|Btop-4,9/12|Btop-5,11/12|Btop-6}
              ] (-3.5,0)--(3.5,0);
              draw (0,0) node[above] {$+$};
              draw[line width=3pt,blue,
              insert target/.list={1/12|Bbot-1,3/12|Bbot-2,5/12|Bbot-3,7/12|Bbot-4,9/12|Bbot-5,11/12|Bbot-6}] (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
              foreach X in {1,...,6}
              {draw[->-=0.5] (target-Bbot-X) -- (0,0-|target-Bbot-X);}
              draw (0,-2.7) node[below] {$-$};
              end{scope}
              node[anchor=south] at (B.north) {B};
              %
              begin{scope}[local bounding box=C,yshift=-6cm]
              draw[line width=3pt,red,
              %insert target/.list={1/12|Ctop-1,3/12|Ctop-2,5/12|Ctop-3,7/12|Ctop-4,9/12|Ctop-5,11/12|Ctop-6}
              ] (-3.5,0)--(3.5,0);
              draw (0,0) node[above] {$+$};
              draw[line width=3pt,blue,
              insert target/.list={1/12|Cbot-1,3/12|Cbot-2,5/12|Cbot-3,7/12|Cbot-4,9/12|Cbot-5,11/12|Cbot-6}]
              (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
              foreach X in {1,...,6}
              {draw[-<-=0.5] (target-Cbot-X) to[out=69+6*X,in=-90]
              ([xshift={(3.5-X)*1.3mm}]target-Cbot-X |-0,0);
              }
              draw (0,-2.7) node[below] {$-$};
              end{scope}
              node[anchor=south] at (C.north) {C};
              %
              begin{scope}[local bounding box=D,xshift=8cm,yshift=-6cm]
              draw[line width=3pt,red,
              insert target/.list={1/12|Dtop-1,3/12|Dtop-2,5/12|Dtop-3,7/12|Dtop-4,9/12|Dtop-5,11/12|Dtop-6}] (-3.5,0)--(3.5,0);
              draw (0,0) node[above] {$+$};
              draw[line width=3pt,blue,
              insert target/.list={1/12|Dbot-1,3/12|Dbot-2,5/12|Dbot-3,7/12|Dbot-4,9/12|Dbot-5,11/12|Dbot-6}] (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
              foreach X in {1,...,6}
              {draw[->-=0.5] (target-Dbot-X) to[out=69+6*X,in=-90]
              ([xshift={(3.5-X)*1.3mm}]target-Dbot-X |-0,0);
              }
              draw (0,-2.7) node[below] {$-$};
              end{scope}
              node[anchor=south] at (D.north) {D};
              end{tikzpicture}
              end{document}


              enter image description here






              share|improve this answer




























                1














                Welcome to TeX.SE! decoration.markings and foreach can help a lot here. The arrows in the middle are (essentially) from here. And decorations.markings is also used to set marks along the blue curves. They get used to define the starting points of the arrows. The to[out=...,int=...] is used to bend the paths in C and D.



                documentclass[tikz,border=3mm]{standalone} 
                usetikzlibrary{decorations.markings,arrows.meta}
                tikzset{->-/.style={postaction={decorate,decoration={
                markings,
                mark=at position #1 with {arrow[arsty]{>}}}}},
                -<-/.style={postaction={decorate,decoration={
                markings,
                mark=at position #1 with {arrow[arsty]{<}}}}},
                insert target/.style args={#1|#2}{postaction={decorate,decoration={
                markings,
                mark=at position #1 with {coordinate (target-#2);}}}}
                }
                begin{document}
                begin{tikzpicture}[arsty/.style={},>=Latex,font=sffamily]
                begin{scope}[local bounding box=A]
                draw[line width=3pt,red,
                %insert target/.list={1/12|Atop-1,3/12|Atop-2,5/12|Atop-3,7/12|Atop-4,9/12|Atop-5,11/12|Atop-6}
                ] (-3.5,0)--(3.5,0);
                draw (0,0) node[above] {$+$};
                draw[line width=3pt,blue,
                insert target/.list={1/12|Abot-1,3/12|Abot-2,5/12|Abot-3,7/12|Abot-4,9/12|Abot-5,11/12|Abot-6}] (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
                foreach X in {1,...,6}
                {draw[-<-=0.5] (target-Abot-X) -- (0,0-|target-Abot-X);}
                draw (0,-2.7) node[below] {$-$};
                end{scope}
                node[anchor=south] at (A.north) {A};
                %
                begin{scope}[local bounding box=B,xshift=8cm]
                draw[line width=3pt,red,
                %insert target/.list={1/12|Btop-1,3/12|Btop-2,5/12|Btop-3,7/12|Btop-4,9/12|Btop-5,11/12|Btop-6}
                ] (-3.5,0)--(3.5,0);
                draw (0,0) node[above] {$+$};
                draw[line width=3pt,blue,
                insert target/.list={1/12|Bbot-1,3/12|Bbot-2,5/12|Bbot-3,7/12|Bbot-4,9/12|Bbot-5,11/12|Bbot-6}] (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
                foreach X in {1,...,6}
                {draw[->-=0.5] (target-Bbot-X) -- (0,0-|target-Bbot-X);}
                draw (0,-2.7) node[below] {$-$};
                end{scope}
                node[anchor=south] at (B.north) {B};
                %
                begin{scope}[local bounding box=C,yshift=-6cm]
                draw[line width=3pt,red,
                %insert target/.list={1/12|Ctop-1,3/12|Ctop-2,5/12|Ctop-3,7/12|Ctop-4,9/12|Ctop-5,11/12|Ctop-6}
                ] (-3.5,0)--(3.5,0);
                draw (0,0) node[above] {$+$};
                draw[line width=3pt,blue,
                insert target/.list={1/12|Cbot-1,3/12|Cbot-2,5/12|Cbot-3,7/12|Cbot-4,9/12|Cbot-5,11/12|Cbot-6}]
                (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
                foreach X in {1,...,6}
                {draw[-<-=0.5] (target-Cbot-X) to[out=69+6*X,in=-90]
                ([xshift={(3.5-X)*1.3mm}]target-Cbot-X |-0,0);
                }
                draw (0,-2.7) node[below] {$-$};
                end{scope}
                node[anchor=south] at (C.north) {C};
                %
                begin{scope}[local bounding box=D,xshift=8cm,yshift=-6cm]
                draw[line width=3pt,red,
                insert target/.list={1/12|Dtop-1,3/12|Dtop-2,5/12|Dtop-3,7/12|Dtop-4,9/12|Dtop-5,11/12|Dtop-6}] (-3.5,0)--(3.5,0);
                draw (0,0) node[above] {$+$};
                draw[line width=3pt,blue,
                insert target/.list={1/12|Dbot-1,3/12|Dbot-2,5/12|Dbot-3,7/12|Dbot-4,9/12|Dbot-5,11/12|Dbot-6}] (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
                foreach X in {1,...,6}
                {draw[->-=0.5] (target-Dbot-X) to[out=69+6*X,in=-90]
                ([xshift={(3.5-X)*1.3mm}]target-Dbot-X |-0,0);
                }
                draw (0,-2.7) node[below] {$-$};
                end{scope}
                node[anchor=south] at (D.north) {D};
                end{tikzpicture}
                end{document}


                enter image description here






                share|improve this answer


























                  1












                  1








                  1







                  Welcome to TeX.SE! decoration.markings and foreach can help a lot here. The arrows in the middle are (essentially) from here. And decorations.markings is also used to set marks along the blue curves. They get used to define the starting points of the arrows. The to[out=...,int=...] is used to bend the paths in C and D.



                  documentclass[tikz,border=3mm]{standalone} 
                  usetikzlibrary{decorations.markings,arrows.meta}
                  tikzset{->-/.style={postaction={decorate,decoration={
                  markings,
                  mark=at position #1 with {arrow[arsty]{>}}}}},
                  -<-/.style={postaction={decorate,decoration={
                  markings,
                  mark=at position #1 with {arrow[arsty]{<}}}}},
                  insert target/.style args={#1|#2}{postaction={decorate,decoration={
                  markings,
                  mark=at position #1 with {coordinate (target-#2);}}}}
                  }
                  begin{document}
                  begin{tikzpicture}[arsty/.style={},>=Latex,font=sffamily]
                  begin{scope}[local bounding box=A]
                  draw[line width=3pt,red,
                  %insert target/.list={1/12|Atop-1,3/12|Atop-2,5/12|Atop-3,7/12|Atop-4,9/12|Atop-5,11/12|Atop-6}
                  ] (-3.5,0)--(3.5,0);
                  draw (0,0) node[above] {$+$};
                  draw[line width=3pt,blue,
                  insert target/.list={1/12|Abot-1,3/12|Abot-2,5/12|Abot-3,7/12|Abot-4,9/12|Abot-5,11/12|Abot-6}] (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
                  foreach X in {1,...,6}
                  {draw[-<-=0.5] (target-Abot-X) -- (0,0-|target-Abot-X);}
                  draw (0,-2.7) node[below] {$-$};
                  end{scope}
                  node[anchor=south] at (A.north) {A};
                  %
                  begin{scope}[local bounding box=B,xshift=8cm]
                  draw[line width=3pt,red,
                  %insert target/.list={1/12|Btop-1,3/12|Btop-2,5/12|Btop-3,7/12|Btop-4,9/12|Btop-5,11/12|Btop-6}
                  ] (-3.5,0)--(3.5,0);
                  draw (0,0) node[above] {$+$};
                  draw[line width=3pt,blue,
                  insert target/.list={1/12|Bbot-1,3/12|Bbot-2,5/12|Bbot-3,7/12|Bbot-4,9/12|Bbot-5,11/12|Bbot-6}] (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
                  foreach X in {1,...,6}
                  {draw[->-=0.5] (target-Bbot-X) -- (0,0-|target-Bbot-X);}
                  draw (0,-2.7) node[below] {$-$};
                  end{scope}
                  node[anchor=south] at (B.north) {B};
                  %
                  begin{scope}[local bounding box=C,yshift=-6cm]
                  draw[line width=3pt,red,
                  %insert target/.list={1/12|Ctop-1,3/12|Ctop-2,5/12|Ctop-3,7/12|Ctop-4,9/12|Ctop-5,11/12|Ctop-6}
                  ] (-3.5,0)--(3.5,0);
                  draw (0,0) node[above] {$+$};
                  draw[line width=3pt,blue,
                  insert target/.list={1/12|Cbot-1,3/12|Cbot-2,5/12|Cbot-3,7/12|Cbot-4,9/12|Cbot-5,11/12|Cbot-6}]
                  (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
                  foreach X in {1,...,6}
                  {draw[-<-=0.5] (target-Cbot-X) to[out=69+6*X,in=-90]
                  ([xshift={(3.5-X)*1.3mm}]target-Cbot-X |-0,0);
                  }
                  draw (0,-2.7) node[below] {$-$};
                  end{scope}
                  node[anchor=south] at (C.north) {C};
                  %
                  begin{scope}[local bounding box=D,xshift=8cm,yshift=-6cm]
                  draw[line width=3pt,red,
                  insert target/.list={1/12|Dtop-1,3/12|Dtop-2,5/12|Dtop-3,7/12|Dtop-4,9/12|Dtop-5,11/12|Dtop-6}] (-3.5,0)--(3.5,0);
                  draw (0,0) node[above] {$+$};
                  draw[line width=3pt,blue,
                  insert target/.list={1/12|Dbot-1,3/12|Dbot-2,5/12|Dbot-3,7/12|Dbot-4,9/12|Dbot-5,11/12|Dbot-6}] (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
                  foreach X in {1,...,6}
                  {draw[->-=0.5] (target-Dbot-X) to[out=69+6*X,in=-90]
                  ([xshift={(3.5-X)*1.3mm}]target-Dbot-X |-0,0);
                  }
                  draw (0,-2.7) node[below] {$-$};
                  end{scope}
                  node[anchor=south] at (D.north) {D};
                  end{tikzpicture}
                  end{document}


                  enter image description here






                  share|improve this answer













                  Welcome to TeX.SE! decoration.markings and foreach can help a lot here. The arrows in the middle are (essentially) from here. And decorations.markings is also used to set marks along the blue curves. They get used to define the starting points of the arrows. The to[out=...,int=...] is used to bend the paths in C and D.



                  documentclass[tikz,border=3mm]{standalone} 
                  usetikzlibrary{decorations.markings,arrows.meta}
                  tikzset{->-/.style={postaction={decorate,decoration={
                  markings,
                  mark=at position #1 with {arrow[arsty]{>}}}}},
                  -<-/.style={postaction={decorate,decoration={
                  markings,
                  mark=at position #1 with {arrow[arsty]{<}}}}},
                  insert target/.style args={#1|#2}{postaction={decorate,decoration={
                  markings,
                  mark=at position #1 with {coordinate (target-#2);}}}}
                  }
                  begin{document}
                  begin{tikzpicture}[arsty/.style={},>=Latex,font=sffamily]
                  begin{scope}[local bounding box=A]
                  draw[line width=3pt,red,
                  %insert target/.list={1/12|Atop-1,3/12|Atop-2,5/12|Atop-3,7/12|Atop-4,9/12|Atop-5,11/12|Atop-6}
                  ] (-3.5,0)--(3.5,0);
                  draw (0,0) node[above] {$+$};
                  draw[line width=3pt,blue,
                  insert target/.list={1/12|Abot-1,3/12|Abot-2,5/12|Abot-3,7/12|Abot-4,9/12|Abot-5,11/12|Abot-6}] (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
                  foreach X in {1,...,6}
                  {draw[-<-=0.5] (target-Abot-X) -- (0,0-|target-Abot-X);}
                  draw (0,-2.7) node[below] {$-$};
                  end{scope}
                  node[anchor=south] at (A.north) {A};
                  %
                  begin{scope}[local bounding box=B,xshift=8cm]
                  draw[line width=3pt,red,
                  %insert target/.list={1/12|Btop-1,3/12|Btop-2,5/12|Btop-3,7/12|Btop-4,9/12|Btop-5,11/12|Btop-6}
                  ] (-3.5,0)--(3.5,0);
                  draw (0,0) node[above] {$+$};
                  draw[line width=3pt,blue,
                  insert target/.list={1/12|Bbot-1,3/12|Bbot-2,5/12|Bbot-3,7/12|Bbot-4,9/12|Bbot-5,11/12|Bbot-6}] (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
                  foreach X in {1,...,6}
                  {draw[->-=0.5] (target-Bbot-X) -- (0,0-|target-Bbot-X);}
                  draw (0,-2.7) node[below] {$-$};
                  end{scope}
                  node[anchor=south] at (B.north) {B};
                  %
                  begin{scope}[local bounding box=C,yshift=-6cm]
                  draw[line width=3pt,red,
                  %insert target/.list={1/12|Ctop-1,3/12|Ctop-2,5/12|Ctop-3,7/12|Ctop-4,9/12|Ctop-5,11/12|Ctop-6}
                  ] (-3.5,0)--(3.5,0);
                  draw (0,0) node[above] {$+$};
                  draw[line width=3pt,blue,
                  insert target/.list={1/12|Cbot-1,3/12|Cbot-2,5/12|Cbot-3,7/12|Cbot-4,9/12|Cbot-5,11/12|Cbot-6}]
                  (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
                  foreach X in {1,...,6}
                  {draw[-<-=0.5] (target-Cbot-X) to[out=69+6*X,in=-90]
                  ([xshift={(3.5-X)*1.3mm}]target-Cbot-X |-0,0);
                  }
                  draw (0,-2.7) node[below] {$-$};
                  end{scope}
                  node[anchor=south] at (C.north) {C};
                  %
                  begin{scope}[local bounding box=D,xshift=8cm,yshift=-6cm]
                  draw[line width=3pt,red,
                  insert target/.list={1/12|Dtop-1,3/12|Dtop-2,5/12|Dtop-3,7/12|Dtop-4,9/12|Dtop-5,11/12|Dtop-6}] (-3.5,0)--(3.5,0);
                  draw (0,0) node[above] {$+$};
                  draw[line width=3pt,blue,
                  insert target/.list={1/12|Dbot-1,3/12|Dbot-2,5/12|Dbot-3,7/12|Dbot-4,9/12|Dbot-5,11/12|Dbot-6}] (-3.5,-2) to[out=-20,in=-160] (3.5,-2);
                  foreach X in {1,...,6}
                  {draw[->-=0.5] (target-Dbot-X) to[out=69+6*X,in=-90]
                  ([xshift={(3.5-X)*1.3mm}]target-Dbot-X |-0,0);
                  }
                  draw (0,-2.7) node[below] {$-$};
                  end{scope}
                  node[anchor=south] at (D.north) {D};
                  end{tikzpicture}
                  end{document}


                  enter image description here







                  share|improve this answer












                  share|improve this answer



                  share|improve this answer










                  answered 44 mins ago









                  marmotmarmot

                  98.8k4113219




                  98.8k4113219






















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                      Someone is a new contributor. Be nice, and check out our Code of Conduct.













                      Someone is a new contributor. Be nice, and check out our Code of Conduct.












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