A bar magnet with a magnetic moment 5,0 Am 2 is placed in p…

Physics Magnetic Effects of Current Torque on a Magnetic Dipole Single Correct MCQ

Published on: September 13, 2026

A bar magnet with a magnetic moment 5,0 Am 2 is placed in parallel position relative to a magnetic field of 0.4 T. The amount of required work done in turning the magnet form parallel to antiparallel position relative to the field direction is________.

1 J

2 J

Zero

Text Solution

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The correct answer is:

u = - MB cosθ

W = n

W = - MB cos 180° (- mB cos0°)

W = 2 MB = 2 x 5 x 0.4 = 4J

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