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A particle of mass m and charge -q is mo...

A particle of mass m and charge -q is moving with a uniform speed v in a circle of radius r, with another charge q at the centre of the circle. The value of r is:

A

`(4pi r^(2)E_0)/(mu_(0)u)`

B

`1/(4pi E_0).(mv^2)/q^2`

C

`1/(4pi).(mv^2)/q^2`

D

`1/(4pi E_0).(mq^2)/v^2`

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