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A magnetic field vecB is confined to a r...

A magnetic field `vecB` is confined to a region `r le a` and points out of the paper (the z axis), r = 0 being the centre of the circular region. A charged ring (charge = Q) of radius b, `b>a` and mass m lies in the x-y plane with its centre at the origin. The ring is free to rotate and is at rest. the magnetic field is brought to zero in time `Deltat`. Find the angular velocity `omega` of the ring after the field vanishes.

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