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Charge q is uniformly spread on thin rin...

Charge q is uniformly spread on 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

A

`(mu_(0)qf)/(2pi R)`

B

`(mu _(0)q)/(2piR)`

C

`(mu_(0)q)/(2fR)`

D

`(mu_(0)qf)/(2R)`

Text Solution

Verified by Experts

The correct Answer is:
D
`B=(mu_(0)I)/(2R)=(mu_(0))/(2R)((q)/(t))=(mu_(0)qf)/(2R)`
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