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NEET 2011

Exam: NEET
Year: 2011
Subject: Physics
Chapter: Magnetic Properties of Matter

NEET 2011 · Physics · Magnetic Properties of Matter

A short bar magnet of magnetic moment 0.4 ~J ~T^ -1 is place in a...

A short bar magnet of magnetic moment

0.4 \mathrm{~J} \mathrm{~T}^{-1}

is place in a uniform magnetic field of

0.16 \mathrm{~T}

. The magnet is stable equilibrium when the potential energy is

Options

A $-0.64 \mathrm{~J}$
Bzero
C $-0.082 \mathrm{~J}$
D $0.064 \mathrm{~J}$

Correct answer

D. $0.064 \mathrm{~J}$

Step-by-step solution

We know that

U=-M B \cos \theta

For stable equilibrium

\theta=0^{\circ}

\begin{aligned} U & =-M B \\ & =-(0.4)(0.16)=-0.064 \mathrm{~J} \end{aligned}

$$

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