Two point charges q and - are separated by a distance 2L. Find the flux of the electric field vector across the circle of radius R is shown.

Options

A. `(q)/( 2 in _0){1- (d)/(sqrt(d^2 +r^2))}`
B. `(q)/(in_0) {1- (d)/(sqrt(d^2 +r^2))}`
C. `(2q)/( in_0) {1- (d)/(sqrt(d^2 +r^2))}`
D. Zero

Answer

B