AIIMS 2019 Physics Bohr's Model MCQ Question

The magnetic field $B$ at the center of a hydrogen atom, where an electron is revolving in the $n = 3$ orbit, can be calculated using the formula $B = \frac{\mu_0 I}{2r}$, where $I$ is the current due to the electron's motion and $r$ is the radius of the orbit. For the $n = 3$ orbit, the current $I$ can be derived from the electron's charge and orbital frequency, resulting in a magnetic field of approximately $0.1 \, \text{T}$. Other options, such as $5 \, \text{T}$, $0.5 \, \text{T}$, and $0.05 \, \text{T}$, are incorrect as they do not align with the calculated values based on the principles of electromagnetism and quantum mechanics for the hydrogen atom.