Two charges, each equal to , are kept at and on the -axis. A particle of mass and…

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

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 (1)

y

(2)

-y

(3)

\frac{1}{y}

(4)

-\frac{1}{y}