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

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