A ring of radius $R$, made of an insulating material carries a charge $Q$ uniformly distributed on it. If the ring rotates about the axis passing through its centre and normal to plane of the ring with constant angular speed $\omega $, then the magnitude of the magnetic moment of the ring is
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(b) $M = iA = i \times \pi {R^2}$also $i = \frac{{Q\omega }}{{2\pi }} \Rightarrow M = \frac{1}{2}Q\omega {R^2}$
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