A magnetic field B is confined to a region r 
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 
t. The angular velocity 
of the ring after the field vanishes, is
Text Solution
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Let E is the electric field generated around the charged ring of radius b, then
Or 
……. (i)
Torque acting on the ring
[Using (i)]
If 
is change in angular momentum of the charged ring then
As initial angular momentum 
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