A charge q coulomb moves in a circle at ...

A charge q coulomb moves in a circle at n revolution per second and the radius of the circle is r metre. Then magnetic feild at the centre of the circle is

`(2piq)/(nr)xx10^(-7)N//amp//metre`

`(2piq)/rxx10^(-7)xx10^(-7)N//amp//metre`

`(2pinq)/rxx10^(-7)N//amp//metre`

`(2piq)/rN//amp//metre`

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