Two point charges and are separated by a distance

PHYSICS · Subjective · AP · Physics C: Electricity and Magnetism · Electric Charges Fields and Gauss's Law · Electric Charges Fields and Gauss's Law

Problem

Two point charges

q

and

-q

are separated by a distance

2l

. Find the flux of the electric field across a circle of radius

r

placed with its centre at the midpoint of the line joining the two charges, in the perpendicular plane.