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Find the expression of radius of an orbit of electron in terms of nucleus charge `Q_2`, tangential velocity v and mass of electron `m_e` ?

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`F_e=F_c`
`(KQ_1Q_2)/r^2=(m_ev^2)/r`
`r=(KQ_1Q_2)/(m_eV^2)`, where `K=1/(4piepsilon_0)`

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