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If a uniformly charged non-conducting spherical body is rotating with angular velocity \( \omega \), the charge and mass of body are \( q \) and \( m \) respectively, then the magnetic moment is
(1) \( \frac{1}{5} q r^{2} \omega \)
(2) \( \frac{2}{5} q r^{2} \omega \)
(3) \( \frac{1}{3} q r^{2} \omega \)
(4) \( \frac{2}{3} q r^{2} \omega \)
\( \mathrm{P} \)
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