The magnetic moment of an electron $(e)$ revolving in an orbit around a nucleus with an orbital angular momentum $\vec{L}$ is given by:
- A$\vec{\mu}_{L} = \frac{e \vec{L}}{2m}$
- B$\vec{\mu}_{L} = -\frac{e \vec{L}}{2m}$
- C$\vec{\mu}_{L} = -\frac{e \vec{L}}{m}$
- D$\vec{\mu}_{L} = \frac{2e \vec{L}}{m}$
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