PhysicsJEE Main 2 Apr 2026, Shift 2·Q22·Numerical·Moderate

Atoms · Bohr model

Using Bohr's model, calculate the ratio of the magnetic fields generated due to the motion of the electrons in the

2^{\text{nd}}

and

4^{\text{th}}

orbits of hydrogen atom .

We corrected a printing error in the original paper

Answer corrected; the source key is (64) — $B = \mu_0 I/2r$ with $I = ev/2\pi r$ gives $B \propto 1/n^5$ , so $B_2/B_4 = 2^5 = 32$ ; the source solution evaluates $4^5/2^5$ as 64.

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Atoms · Bohr model

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