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>> Q1=1,Q2=-4,d=2; x=-5:0.1:5; y=-5:0.1:5; [X,Y]=meshgrid(x,y); R1=sqrt(X.^2+(Y- d./2).^2); R2=sqrt(X.^2+(Y+ d./2).^2); Z= Q1*(Y-d./2)./R1+Q2*(Y+d./2)./R2; C=-5:0.22:5; hold on [S,h] = contour(X,Y,Z,C); clabel(S); plot(0,d/2,'marker','o','markersize',10,'markerfacecolor','g','markeredgecolor','g'); text(0,d/2,'+','fontsize',20); plot(0,-d/2,'marker','o','markersize',10,'markerfacecolor','g','markeredgecolor','g'); text(0,-d/2,'-','fontsize',20); grid on,title('');

>> Q1=1,Q2=-4,d=2; x=-5:0.1:5; y=-5:0.1:5; [X,Y]=meshgrid(x,y); R1=sqrt(X.^2+(Y- d./2).^2); R2=sqrt(X.^2+(Y+ d./2).^2); Z= (Q1./R1)+(Q2./R2); C=-4:0.55:1; [S,h] = contour(X,Y,Z,C); clabel(S);

hold on plot(0,d/2,'marker','o','markersize',10,'markerfacecolor','g','markeredgecolor','g'); text(0,d/2,'+','fontsize',20); plot(0,-d/2,'marker','o','markersize',10,'markerfacecolor','g','markeredgecolor','g'); text(0,-d/2,'-','fontsize',20); grid on,title('');

¼T >> Q1=1,Q2=-4,d=2; x=-5:0.1:5; y=-5:0.1:5; [X,Y]=meshgrid(x,y); R1=sqrt(X.^2+(Y- d./2).^2); R2=sqrt(X.^2+(Y+ d./2).^2); Z= (Q1./R1)+(Q2./R2); C=-4:0.55:1; [Ex,Ey]=gradient(-Z); E=sqrt(Ex.^2+Ey.^2); Ex=Ex./E,Ey=Ey./E; hold on; plot(0,d/2,'marker','o','markersize',10,'markerfacecolor','g','markeredgecolor','g'); text(0,d/2,'+','fontsize',20); plot(0,-d/2,'marker','o','markersize',10,'markerfacecolor','g','markeredgecolor','g'); text(0,-d/2,'-','fontsize',20); hold on; H=quiver(X,Y,Ex,Ey,0.5) grid on,title('¼T');


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