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

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

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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