A uniform circular ring of radius \( R \), mass \( m \) has uniformly distributed charge \( q \)...

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A uniform circular ring of radius \( R \), mass \( m \) has uniformly distributed charge \( q \). The ring is free to rotate about its own axis (which is vertical) without friction. In the space, a uniform magnetic field \( B \), directed vertically downwards, exists in a cylindrical region. Cylindrical region of magnetic field is coaxial with the ring and has radius greater than \( R \). If induction of magnetic field starts increasing at a constant rate, the angular acceleration of the ring will be
(a) Directly proportional to \( R \)
(b) Directly proportional to \( q \)
(c) Directly proportional to \( m \)
(d) Independent of \( R \) and \( m \)
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