A particle of mass 'm' carry a charge of '-q1' starts moving around a fixed charge q2 along a circular path of radius r. What will be the period of revolution?

F_e=Centripital force

k*q1*q2/r² = Mrw²  [w=omega]

w²= k*q1*q2/Mr³

(2Π/T )²= k*q1*q2/Mr³

T² = 4Π² Mr³/k*q1*q2

T = (4Π² Mr³/k*q1*q2)^1/2

^{In case of any difficulty, please feel free to contact.}

^Regards

^{Arun (askIITians forum expert)}