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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
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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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The magnetic needle of a tangent galvanometer is deflected at an angle .The horizontal component of earth's magnetic field is along the plane of the coil. The magnetic induction produced by the coil at its center is
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