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NEET 2011 (AIPMT, Mains) · Field of a Magnet & Magnet in a Uniform Field

Field of a Magnet & Magnet in a Uniform Field question from NEET 2011 (AIPMT, Mains)

Q26NEET 2011 · AIPMT · MAINSEasy

Field of a Magnet & Magnet in a Uniform Field

A short bar magnet of magnetic moment 0.4 J T ${}^{-1}$ is placed in a uniform magnetic field of 0.16 T. The magnet is in stable equilibrium when the potential energy is

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Answer: (b)

Stable equilibrium: $\theta = 0^\circ$ , so $U = -MB$ .
$U = -0.4 \times 0.16 = -0.064\ \text{J}$
So the answer is (b).

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