A uniform ring of radius \( \mathrm{R} \), mass \( m \) has uniform...
0A uniform ring of radius \( \mathrm{R} \), mass \( m \) has uniformly distributed charge q. The ring is free to rotate about
P its own axis (which is vertical) without friction. In
W the space, A uniform magnetic field \( \mathrm{B} \) exists in a cylindrical region directed vertically downward. Cylindrical region of magnetic field is co axial with ring \( \& \) has radius \( rR \). If magnetic field starts increasing at a constant rate \( \frac{\mathrm{dB}}{\mathrm{dt}}=a \). Angular \( \theta \) acceleration of the ring will be:
(1) \( \frac{\mathrm{qR}}{2 \mathrm{rm}} \frac{\mathrm{dB}}{\mathrm{dt}} \)
(2) \( \frac{\mathrm{q}}{2 \mathrm{~m}} \frac{\mathrm{dB}}{\mathrm{dt}} \)
(3) \( \frac{\mathrm{qR}}{\mathrm{rm}} \frac{\mathrm{dB}}{\mathrm{dt}} \)
(4) \( \frac{\mathrm{qR}}{\mathrm{m}} \frac{\mathrm{dB}}{\mathrm{dt}} \)
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