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A particle having charge + q is fixed at...

A particle having charge + q is fixed at a point O and a second particle of mass m and having charge `-q_(0)` moves with constant speed in a circle of radius r about the charge +q. the energy required to be supplied to the moving charge to increase radius of the path to 2r is `(q q_(0))/(n pi epsi_(0) r)`. Find the value of n.

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