JEE Main 2021PhysicsAtomic PhysicsMediumNumerical

JEE Main 2021 — Atomic Physics Question with Solution

JEE Main 2021 (27 Jul Shift 1)

Question

In Bohr's atomic model, the electron is assumed to revolve in a circular orbit of radius 0.5 A∘. If the speed of electron is 2.2×106 m s-1. Then the current associated with the electron will be__________ ×10-2 mA. [Take π as 227

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Show full solutionCorrect answer: 112
Correct answer
112

Step-by-step explanation

Time taken to revolve in circular orbit is T=2πω=2πrv=2×227×5×10-112.2×106=107×10-16 s

Now, current associated with the electron is I=eT=1.6×10-19107×10-16=1.12×10-3A
⇒I=1.12 mA
Hence, the current is 112×102 mA.

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About this question

This is a previous-year question from JEE Main 2021, 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.