Four identical point charges

PHYSICS · Single correct · CBSE · Physics · Electrostatic Potential and Capacitance · Electrostatic Potential and Capacitance

Problem

Four identical point charges, each of magnitude

+q

, are fixed at the corners of a square of side

a

. What is the electric potential at the midpoint of one of the sides of the square? (a)

\dfrac{8kq}{a}

(b)

\dfrac{4kq}{a}\left(1-\dfrac{1}{\sqrt{5}}\right)

(c)

\dfrac{4kq}{a}\left(1+\dfrac{1}{\sqrt{5}}\right)

(d)

\dfrac{2kq}{a}\left(1+\dfrac{1}{\sqrt{5}}\right)