JEE Main 2020PhysicsElectromagnetic InductionMediumMCQ

JEE Main 2020 — Electromagnetic Induction Question with Solution

JEE Main 2020 (03 Sep Shift 2)

Question

A uniform magnetic field B exists in a direction perpendicular to the plane of a square loop made of a metal wire. The wire has a diameter of 4 mm and a total length of 30 cm. The magnetic field changes with time at a steady rate dB/dt=0.032Ts-1. The induced current in the loopis close to (Resistivity of the metal wire is 1.23×10-8 Ωm )

Choose an option

Show full solutionCorrect option: B
Correct answer
B0.61 A

Step-by-step explanation

Radius =d/2=2 mm

Rwire=ρlA

ϕ=BA ; e=dϕdt=dBdtA

i=eR=dBdtA2ρl=0.032×π×2×10-321.23×10-8×4×0.3

=0.61 A

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About this question

This is a previous-year question from JEE Main 2020, 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.