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clear q1=2; q2=3; q=q1/q2; x1=-2; x2=2; d=x2-x1; xm=5; ym=5;
x=linspace(-xm,xm); y=linspace(-ym,ym); [X,Y]=meshgrid(x,y); R1=sqrt((X+x2).^2+Y.^2) R2=sqrt((X+x1).^2+Y.^2); U=1./R1+q./R2; u=1:0.5:4; figure
contour(X,Y,U,u) grid on
legend(num2str(u')) hold on
plot([-xm;xm],[0;0]) plot([0;0],[-ym;ym])
plot(x1,0,'o','MarkerSize',12)
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