Practice portal › Electric Potential and Capacitance › Electric Potential
Asked in GSEB Board July 2022 · Equipotential surfaces and V-r graphs
Idea: the work done in moving a charge q between two points is W = q(V_f - Vᵢ).
All points of an equipotential surface have the same potential, so V_f = Vᵢ.
W = q×0 = 0 for any path lying on the surface.
(Equivalently, ⃗E is normal to the surface, so the electric force is perpendicular to every step.)
So the work done is zero.
Reading this solution needs no sign-in. You only sign in to practise against the clock and keep your progress.
Practise this with a timer