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A bar magnet, of magnetic moment M⃗ , is placed in a magnetic field of induction B⃗ . The torque exerted on it is:

1. M⃗ × B⃗
2. -M⃗ · B⃗
3. M⃗ × B⃗
4. B⃗ × M⃗

Correct answer: M⃗ × B⃗

Solution

The torque on a magnetic dipole in a magnetic field is given by the vector cross product of the magnetic moment (M⃗) and the magnetic field (B⃗), which is M⃗ × B⃗.

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