Charge $q$ is uniformly spread on a thin ring of radius $R.$ The ring rotates about its axis with a uniform frequency $f\, Hz.$ The magnitude of magnetic induction at the center of the ring is
AIPMT 2011,AIPMT 2010, Medium
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The current flowing in the ring is
$I=q f.........(i)$
The magnetic induction at the centre of the ring is
$B=\frac{\mu_{0} 2 \pi I}{4 \pi R}=\frac{\mu_{0} q f}{2 R} \quad(\text { Using }(\mathrm{i}))$
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