The angle made by the orbital angular momentum of an electron with the direction of its orbital magnetic moment is: (in $^{\circ}$)

In the Bohr model,an electron moves in a circular orbit around the proton. Considering the orbiting electron to be a circular current loop,the magnetic moment of the hydrogen atom when the electron is in the $n^{th}$ orbit is:

If the charge to mass ratio of an electron is $A \ C/kg$,then the gyromagnetic ratio of an orbital electron in $C/kg$ is

An electron of charge $e$ and mass $m$ is moving in a circular path of radius $r$ with a uniform angular speed $\omega$. Which of the following statements are correct?

The magnetic moment of a revolving electron of charge $e$ and mass $m$ in terms of the angular momentum $L$ of the electron is:

Define Bohr magneton using Bohr's first hypothesis.