Question

A non conducting disc of radius R, charge q is rotating about an axis passing through its centre and perpendicular to its plane with an angular velocity $\omega$ chaise q iS uniformly distributed over its surface. The magnetic moment of the disc is

• A. $\frac{1}{4}q\omega R^2$
• B. $\frac{1}{2}q\omega R$
• C. $q\omega R$
• D. $\frac{1}{2}q\omega R^2$

Answer 1

Answer: (A)

$\frac{1}{4}q\omega R^2$

Answer 2

$M=(I\omega )\frac{q}{2m}$