In an atom, two electrons move around the nucleus in circular orbit...

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In an atom, two electrons move around the nucleus in circular orbits of radii \( R \) and \( 4 \mathrm{R} \). The ratio of the time taken by them to complete one revolution is : (neglect electric interaction)
\( \mathrm{P} \)
(A) \( 1: 4 \)
(B) \( 4: 1 \)
(C) \( 1: 8 \)
(D) \( 8: 1 \)
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