Physics

Problem

Two charges, each equal to

q

, are kept at

x = -a

and

x = a

on the

x

-axis. A particle of mass

m

and charge

q_0 = \frac{q}{2}

is placed at the origin. If charge

q_0

is given a small displacement (

y \ll a

) along the

y

-axis, the net force acting on the particle is proportional to a.

y

-y

\frac{1}{y}

-\frac{1}{y}