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

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Perpendicular to the fleld of the earth

Parallel to the vertical component of the earth's field

At an angle of 33o with respect to the N-S direction

Along the North-South (N-S) direction

answer is A.

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Detailed Solution

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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