Rankers Physics
Topic: Magnetic Effects of Current
Subtopic: Bar Magnet

A plastic disc of radius R has a charge q uniformly distributed over its surface. If the disc is rotated with a frequency f about its axis. then magnetic dipole moment will be :
\[\frac{\pi qfR^{2}}{2}\]
πqfR²
2πqfR²
4πqfR²

No solution provided for this question.

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