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Question

To measure the magnetic moment of a bar magnet, one may not use.

A
a tangent galvanometer.
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B
a deflection magnetometer if BH is known.
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C
a vibration magnetometer if BH is known.
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D
a deflection and vibration magnetometer. If BH is not known.
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Solution

The correct option is A a tangent galvanometer.
Tangent Galvanometer is a type of Galvanometer used to measure the current.
When a a freely suspended magnet is disturbed from its mean position in a uniform magnetic field(Here, earth's magnetic field), it starts vibrating about the mean position. Vibration Magnetometer is used to find period of oscillations which given by the relation, T=2πImBH.
I=Moment of Inertia, BH=Earth's horizontal Magnetic Field, m=Magnetic moment.
Deflection Magnetometer uses Tangent law, which states when a bar magnet is suspended in two Magnetic fields B and BH , it comes to rest making an angle /theta with the direction of BH. In equilibrium state, B=BHtanθ.
One can measure the magnetic moment using both deflection magnetometer and vibration magnetometer, given the value of BH. One can also use both without knowing earth's horizontal magnetic field.

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