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

`(mu_(0)g)/(2pif R)`

`(mu_(0)gf)/(2piR)`

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

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

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