Question

three equipotential surfaces are shown and corresponding them field lines. estimate the field strength at a point' a 'where the distance between the surface is 4 cm​

Answer 1

dv=-E.dr
So intrgate on both sides
So travelling from b to a potentates changes two units
6-8=-E.dr
Distance is 4cm
-2=-E.4
E=0.5v/m