Question

The electric potential a distance r from a small charge is proportional to what power of the distance from the charge?

(A) r^-1
(B) r
(C) r^-2
(D) r^2

Answer 1

Answer: r^-1

Explanation:

V = (k × Q) / r, where V is electric potential, k is constant and r is distance from charge.

Since Q will not change, it can be considered a constant too.

So, we can write V ∝ 1/r

which is same as V ∝ r^-1