Question

Q2. Calculate the work done in moving a charge of 20 uC on the surface of a uniformly charged sphere of radius 5 cm.​

Answer 1

Work done to move a charge is always given as the product of charge with the potential difference through which the charge moves.

$\boxed{W = q \times \Delta V}$

• Now, The potential at surface of sphere remains constant at all points on the surface.

• So, when the charge is being moved on the surface of the sphere, the value of ∆V is actually zero.

$\implies W = (20 \times {10}^{ - 6} )\times 0$

$\implies W = 0 \: Joules$

So, the work done is 0 Joules.