Four identical point charges are fixed at the corners of a square whose side length is

PHYSICS · Single correct · A Level · Physics · Fields and their consequences · Fields and their consequences

Problem

Four identical point charges

+q

are fixed at the corners of a square whose side length is

a

. Which of the following numerical factors multiplies

kq^{2}/a

in the expression for the total electric potential energy of the system? (a)

4

(b)

5

(c)

4+\sqrt{2}

(d)

6