JEE Main 2022PhysicsElectromagnetic InductionMediumNumerical

JEE Main 2022 — Electromagnetic Induction Question with Solution

JEE Main 2022 (26 Jun Shift 1)

Question

A 10 Ω, 20 mH coil carrying constant current is connected to a battery of 20 V through a switch. Now after switch is opened current becomes zero in 100 μs. The average e.m.f. induced in the coil is _____ V.

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Show full solutionCorrect answer: 400
Correct answer
400

Step-by-step explanation

The initial current in the coil will be, i=VR=2010=2 A.

Average e.m.f. developed in the coil will be,

ε=-∆ϕ∆t=0-Lit=20×10-3×2100×10-6=400 V.

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About this question

This is a previous-year question from JEE Main 2022, covering the Electromagnetic Induction 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.