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An electron of charge $e$ moves in a circular orbitof 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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