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
${{{\mu _0}qf} \over {2\pi R}}$
${{{\mu _0}qf} \over {2R}}$
${{{\mu _0}q} \over {2fR}}$
${{{\mu _0}q} \over {2\pi fR}}$
Solution
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