A bar magnet of magnetic moment M , is placed in a magnetic field of induction B. The torque exerted on it is

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A bar magnet of magnetic moment $\mathrm{M}$, is placed in a magnetic field of induction B. The torque exerted on it is

PhysicsMagnetic Properties of MatterVITEEEVITEEE 2017

Options:

A $\overrightarrow{\mathrm{M}} \cdot \overrightarrow{\mathrm{B}}$
B $-\overrightarrow{\mathrm{M}} \cdot \overrightarrow{\mathrm{B}}$
C $\overrightarrow{\mathrm{M}} \times \overrightarrow{\mathrm{B}}$
D $-\vec{B} \cdot \vec{M}$

Solution:

2124 Upvotes Verified Answer

The correct answer is: $\overrightarrow{\mathrm{M}} \times \overrightarrow{\mathrm{B}}$

$\tau=\mathrm{MB} \sin \theta=\overrightarrow{\mathrm{M}} \times \overrightarrow{\mathrm{B}}$

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