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 plane and lies in the equatorial plane of the sphere. Current in the coil is 
. The value of 
if the sphere is in equilibrium is
Text Solution
Verified by ExpertsB
The gravitational torque must be counter balanced by the magnetic torque about 
, for equilibrium of the sphere. The gravitational torque will be given by:
The magnetic moment of the coil
and
for the equilibrium condition, we get
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