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According to Bohr's theory, the expressions for the kinetic and potential energy of an electron revolving in an orbit is given respectively by
(a)+e28πε0r and  -e24πε0r            (b) +8πε0e2r and -4πε0e2r
(c) -e28πε0r and -e24πε0r            (d) +e28πε0r and +e24πε0r

(a) P.E. =-ke2r=-e24πε0r; K.E=-12(PE)=e28πε0r

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