In a hydrogen atom, an electron revolves around the nucleus in an o...

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In a hydrogen atom, an electron revolves around the nucleus in an orbit of radius \( r \) with velocity \( v \), the current corresponding to the revolving electron is
(a) \( I=\frac{e r}{2 \pi v} \)
(b) \( I=\frac{e v}{2 \pi} \)
(c) \( I=\frac{e v}{2 \pi r} \)
(d) \( I=\frac{e v}{\pi r} \)
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