Two equal charges `q` of opposite sign are separated by a small distance `2a`,The electric intensity `E` at a point on the perpendicular bisector of the line joining the two charges at a very large distance `r` form the line is

Options

A. `1/(4 pi epsilon_(0)) (qa)/(r^(2))`
B. `1/(4 pi epsilon_(0)) (2qa)/(r^(2))`
C. `1/(4pi epsilon_(0)) (2qa)/(r^(2))`
D. `1/(4 pi epsilon_(0))(qa)/(r^(2))`

Answer

B

Explanation

Similar to B on equitorial line of a short bar magnet