Two equal point charges are fixed at and on the -axis

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

Problem

Two equal point charges are fixed at

x=-a

and

x=+a

on the

x

-axis. Another point charge

q

is placed at the origin. The change in the electrical potential energy of

q

, when it is displaced by a small distance

x

along the

x

-axis, is approximately proportional to (1)

x

(2)

x^2

(3)

x^3

(4)

1/x