JEE Main 2014PhysicsElectromagnetic InductionEasyMCQ

JEE Main 2014 — Electromagnetic Induction Question with Solution

JEE Main 2014 (19 Apr Online)

Question

The figure shows a circular area of tthe radius R where a uniform magnetic field B→ is going into the plane of the paper and increasing in magnitude at a constant rate. In that case, which of the following graphs, drawn schematically, correctly shows the variation of the induced electric field E(r)?

Choose an option

Show full solutionCorrect option: A
Correct answer
A

Step-by-step explanation

E=dϕdt=AdBdt

for 

r<R, E2πr=πr2dBdt⇒Eαr

for 

r>R, E2πr=πR2dBdt⇒Eα1r

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About this question

This is a previous-year question from JEE Main 2014, 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.