In the figure shown a coil of single turn is wound on a sphere of radius 
and mass 
. The plane of the coil is parallel to the inclined plane and lies in the equatorial plane of the sphere. If sphere is in rotational equilibrium the value of B is (current in the coil is i)
A
B
C
D
None
Text Solution
Verified by ExpertsThe correct answer is:
A
The gravitational torque must be counter balanced by the magnetic torque about O, for equilibrium of the sphere. The gravitational force 
The magnetic torque 
Where the magnetic moment of the coil
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