JEE Main 2021PhysicsElectromagnetic InductionMediumMCQ

JEE Main 2021 — Electromagnetic Induction Question with Solution

JEE Main 2021 (31 Aug Shift 1)

Question

A small square loop of side a and one turn is placed inside a larger square loop of side b and one turn (b≫a). The two loops are coplanar with their centres coinciding. If a current I is passed in the square loop of side  b, then the coefficient of mutual inductance between the two loops is :

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Show full solutionCorrect option: A
Correct answer
Aμ04π82a2 b

Step-by-step explanation

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B=4×μ0i4πb22 ⇒B=22μ0iπb
⇒ϕ=MI ⇒BA=MI
⇒22μ0iπb·a2=Mi ⇒M=22μ0a2πb=μ04π82a2b
 

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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.