How do you plot equipotential electrical field lines on a 2d plot in MATLAB. Would it be best to use either quiver or contourf? Some example points are:p1 = (1,1) with 1 coulomb charge.p2 = (2,2) with 2 coulomb charge.p3 = (3,3) with 3 coulomb charge.All information I've found online to do with super position only has scenarios for 2 points, and even then I dont really understand the principle behind plotting these values.Never really done physics before, so this exercise has blind sided me. Thanks for any help! 
Plotting electrical field lines on a 2d plane
matlab