1.

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.

Answer»

DIRECTLY PROPORTIONAL to R
Directly proportional to q
Directly proportional to m
Independent of R and m

Answer :B


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