A ring of radius \( R \) with charge \( q \) uniformly distributed ...

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A ring of radius \( R \) with charge \( q \) uniformly distributed over it is rotated with angular speed ' \( \omega \) ' around its axis. Find magnetic field at the centre of the ring:-
(1) \( \frac{\mu_{0} q \omega}{2 r} \)
(2) \( \frac{\mu_{0} q \omega}{2 \pi r} \)
(3) \( \frac{\mu_{0} q \omega}{4 \pi r} \)
(4) \( \frac{\mu_{0} q \omega}{4 r} \)
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