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A thin circular disk of radius \( \mathrm{R} \) is uniformly charged with density \( \sigma0 \) per unit area. The disk rotates about its axis with a uniform angular speed \( \omega \). The magnetic moment of the disk is
\( \mathrm{P} \)
(A) \( 2 \pi R^{4} \sigma \omega \)
(B) \( \pi R^{4} \sigma \omega \)
(C) \( \frac{\pi R^{4}}{2} \sigma \omega \)
(D) \( \frac{\pi R^{4}}{4} \sigma \omega \)
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