Q .     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 centre of the ring is

AIPMT 2011
A

`\frac{\mu_{0}qf}{2R}`

B

`\frac{\mu_{0}q}{2fR}`

C

`\frac{\mu_{0}q}{2\pi fR}`

D

`\frac{\mu_{0}qf}{2\pi R}`

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