Question

When a particle of charge 10 C is brought from infinity to a point P, 2.0 mJ of work is done by the external forces . What is the potential at P?

Answer 1

Charge Q = 10 x 10-6 C
Work done W = 2 x 10-3 J
Potential at P = V = W/Q = 2 x 10-3 J/(10 x 10-6 C)
= 2 x 102 V = 200 V.

Answer 2

Given,
Charge= 10 C
Work done= 2mJ= 2×10^-3 J
We know,
V = W/Q
=2×10^-3/10
=2×10^-4 V