JEE Main 2017PhysicsAtomic PhysicsMediumMCQ

JEE Main 2017 — Atomic Physics Question with Solution

JEE Main 2017 (08 Apr Online)

Question

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 nth orbit is proportional to: (n= principal quantum number)

Choose an option

Show full solutionCorrect option: D
Correct answer
Dn-5

Step-by-step explanation

v∝ z n

r∝ n 2 z

B= μI 2R

I= e T = e ( 2πR v ) = e 2π v R

B= μ 0 2 e 2π v R 2

B= μ 0 e 4π z n ( n 2 z ) 2

B=μ0e4πz3n5

B∝ n −5 .

Practice this on the real CBT interface

Solve this JEE Main question (and the rest of the Atomic Physics chapter) on PrepSharp's TCS iON-style CBT player — with timer, bookmarks and session analytics.

Solve interactively →

About this question

This is a previous-year question from JEE Main 2017, covering the Atomic Physics chapter of Physics. PrepSharp catalogues every PYQ from JEE Main with a verified answer key and step-by-step solution prepared by IIT alumni — so you can search by chapter, topic or year and revise efficiently.