Two bar magnets with magnetic moments 2 M and M are fastened together at right angles to each other at their centres to form a crossed system, which can rotate freely about a vertical axis through the centre. The crossed system sets in earth's magnetic field with magnet having magnetic moment 2 M making and angle `theta` with the magnetic meridian such that

Options

A. `theta=tan^(-1)((1)/(sqrt(3)))`
B. `theta =tan^(-1)(sqrt(3))`
C. `theta = tan^(-1)((1)/(2))`
D. `theta = tan^(-1)((3)/(4))`

Answer

C

Explanation

`rArr tan theta =(M)/(2M)=(1)/(2) rArr theta ="tan"^(-1)(1)/(2)`