JEE Main 2021PhysicsElectromagnetic InductionMediumNumerical

JEE Main 2021 — Electromagnetic Induction Question with Solution

JEE Main 2021 (25 Feb Shift 1)

Question

A coil of inductance 2 H having negligible resistance is connected to a source of supply whose voltage is given by V=3t volt. (where t is in second). If the voltage is applied when t=0, then the energy stored in the coil after 4 s in J,

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Show full solutionCorrect answer: 144
Correct answer
144

Step-by-step explanation

ε=LdIdt

3∫04tdt=2∫01dI

32×16=2I

I=12

V=12LI2=12×2122=144 J

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About this question

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