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A thin ring of radius R metre has charg...

A thin ring of radius `R` metre has charge `q` coulomb uniformly spread on it. The ring rotates about its axis with a constant frequency of `f` revolution/s. The value of magnetic induction in `Wb m^(-2)` 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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