Explain orbital magnetic moment and spin magnetic moment.

(N/A) Any charge in uniform circular motion has an associated magnetic moment given by the expression:
$\mu_{l} = \frac{e}{2m_{e}}(l)$
This dipole moment is known as the orbital magnetic moment. Its magnitude is related to the Bohr magneton,which has a value of $9.27 \times 10^{-24} \text{ A m}^2$.
In addition to the orbital magnetic moment,the electron possesses an intrinsic magnetic moment,which has the same numerical value of $9.27 \times 10^{-24} \text{ A m}^2$. This is called the spin magnetic moment.
It is important to note that this does not imply the electron is physically spinning. The electron is an elementary particle and does not have an axis to rotate around like a top or the Earth.