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A charge q coulomb ,moves in a circle of...

A charge q coulomb ,moves in a circle of radius r metres, at n revolutions per second.The magnetic field induction at the centre of the circle will be

A

`(2 pi q)/r NA^-1 m^-1`

B

`(2 pi q)/(nr) xx 10^-7 NA^-1 m^-1`

C

`(2 pi q)/r xx 10^-7 NA^-1 m^-1`

D

`(2 pi nq)/r xx 10^-7 NA^-1 m^-1`

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