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A uniformly charged ring of radius 'R' carrying charge 'Q' is rotating with unniform angular speed 'w(omega)'.
The magnetic field at the centre of the ring is............
u(mu)Qw/2(pi)R....
pls explain.......
i do not where you have doubt so i explain each thing
B at center of a ring =mu.i/2r [this is our articale result]
in this question we do not have only current
what is current it is basicly flow of +ve charge when a ring is rotating then charge Q IS rotating or flowing so it is current
now we have current =charge/time
time period=2pi/w
so i=qw/2pi
just put this value in 1 get your answer ok.
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