Question

The angle made by orbital angular momentum of electron with the direction of the orbital magnetic moment is

• A. $120^{°}$
• B. $60^{°}$
• C. $180^{°}$
• D. $90^{°}$

Answer 1

Answer: (C)

The relation between electron's angular momentum $L$ and magnetic moment $\mu$ given,
$\mu =-\frac{e}{2m_e}L$ where $e$ and $m_e$ are the charges and mass of the electron.
Here, negative sign shows that the angular momentum and magentic moment are in opposite direction to each other i.e., if $L$ in $+z$ -direction then $\mu$ in-z-direction
So, the angle between $L$ and $\mu$ is $180^{\circ }$.