Two identical short bar magnets, each having magnetic moment `M`, are placed a distance of `2d` apart with axes perpendicular to each other in a horizontal plane. The magnetic induction at a point midway between them is

Options

A. `(mu_(0))/(4pi).(sqrt2)(M)/(d^(3))`
B. `(mu_(0))/(4pi).(sqrt3)(M)/(d^(3))`
C. `(mu_(0))/(4pi).(M)/(d^(3))`
D. `(mui_(0))/(4pi).(sqrt5)(M)/(d^(3))`

Answer

D

Explanation

`B=sqrt(B_(axial)^(2)+B_(eq)^(2)`