Let the current $I$ be associated with an electron of charge $e$ moving in a circular orbit of radius $r$ with speed $v$ around the positively charged nucleus. The ratio $\frac{r}{v}$ is

  • A
    $\frac{e I}{2 \pi}$
  • B
    $\frac{2 \pi}{eI}$
  • C
    $\frac{e}{2 \pi I}$
  • D
    $\frac{2 e I}{\pi}$

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