question_answer

According to Bohr's theory, the time averaged magnetic field at the centre (i.e. nucleus) of a hydrogen atom due to the motion of electrons in the \[{{\text{n}}^{\text{th}}}\] orbit is proportional to : (n = principal quantum number)                     [JEE Online 08-04-2017]

A) \[{{\text{n}}^{-3}}\]

B) \[{{\text{n}}^{-2}}\]

C) \[{{\text{n}}^{-4}}\]

D) \[{{\text{n}}^{-5}}\]

Correct Answer: B

Solution :

[b]