A compass needle whose magnetic moment is 60 amp × m 2 pointing geographical north at a certain place, where the horizontal component of earth's magnetic field is 40 μ μ Wb/m 2 , experiences a torque 
. What is the declination at this place
Text Solution
Verified by ExpertsThe correct answer is:
A
If 
is the declination of the place, then the torque acting on the needle is 
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