The magnetic moment of an electron $(e)$ revolving in an orbit around nucleus with an orbital angular momentum is given by :
JEE MAIN 2022, Medium
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Ratio of magnetic moment and angular momentum
$\frac{\vec{\mu}}{\vec{L}}=\frac{q}{2 m}$
For $e^{-}$
$\vec{\mu}=-\frac{e}{2 m} \vec{L}$
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