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Rate of change of torque with deflection is maximum for a magnet suspended freely in a uniform magnetic field of induction B, when
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Correct option is A
τ=MBsinθ or dτdθ= MBcosθThis will be maximum when θ=0o
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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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