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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.......

Praveen Kumar beniwal
26 Points
10 years ago

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.