An electron of charge $e$ moves in a circular orbit of radius $r$ around the nucleus at a frequency $v$. The magnetic moment associated with the orbital motion of the electron is
- A$\pi ve{r^2}$
- B$\frac{\pi v{r^2}}{e}$
- C$\frac{\pi ve}{{r^2}}$
- D$\frac{\pi e{r^2}}{v}$
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