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NEET 2024

Exam: NEET
Year: 2024
Subject: Physics
Chapter: Magnetic Effects of Current

NEET 2024 · Physics · Magnetic Effects of Current

The magnetic potential energy, when a magnetic bar of magnetic...

The magnetic potential energy, when a magnetic bar of magnetic moment

\vec{m}

is placed perpendicular to the magnetic field

\vec{B}

is

Options

A $-\frac{m B}{2}$
BZero
C $-m B$
D $m B$

Correct answer

B. Zero

Step-by-step solution

Potential energy stored in external magnetic field is given by

U=-\vec{m} \cdot \vec{B}

\because

Angle between

\vec{m}

and

\vec{B}

is

90^{\circ}

\therefore \quad U=-m B \cos 90^{\circ}

=0

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