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Questions  

The torque on a bar magnet due to the earth's magnetic field is maximum when the axis of the magnet is

a
Perpendicular to the fleld of the earth
b
Parallel to the vertical component of the earth's field
c
At an angle of 33o with respect to the N-S direction
d
Along the North-South (N-S) direction

detailed solution

Correct option is A

Torque on a bar magnet in earth's magnetic field (BH) is τ = MBH sinθ. τ will be maximum if sinθ = maximum i.e., θ = 90o. Hence, axis of the magnet is perpendicular to the field of earth.

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