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If m is mass of electron, v its velocity, r the radius of stationary circular orbit around a nucleus with charge Ze, then from Bohr's first postulate, the kinetic energy K=12mv2 of the electron in C.G.S. system is equal to

(a) 12Ze2r                             (b) 12Ze2r2
(c) Ze2r                                 (d) Ze2r2

(a) In the revolution of electron, coulomb force provides the necessary centripetal force

ze2r2=mv2rmv2=ze2r K.E. = 12mv2=ze22r

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