A uniform circular ring of radius R, mass m has uniformly distributed charge q. The ring is force to rotate about its own axis (which is vertical) without friction. In the space a uniform magnetic field B, directed vertically down ward exists in a cylindrical region. The cylindrical region is co-axial with B and has a radius greater than R. If B increasesa at a constant rate `(dB)/(dt)=alpha`. angular acceleration of the ring will.
A. Directly proportional to R
B. Directly proportional to q
C. Directly proportional to m
D. Independent of R and m
