JEE Main 2018PhysicsMagnetic Properties of MatterMediumMCQ

JEE Main 2018 — Magnetic Properties of Matter Question with Solution

JEE Main 2018 (15 Apr)

Question

The B-H curve for a ferromagnet is shown in the figure. The ferromagnet is placed inside a long solenoid with 1000 turns cm-1. The current that should be passed in the solenoid to demagnetize the ferromagnet completely is, 

Choose an option

Show full solutionCorrect option: C
Correct answer
C1 mA

Step-by-step explanation

The coercivity of ferromagnet, H=100 A m-1, n×I=100
⇒I=100105=1 mA.

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About this question

This is a previous-year question from JEE Main 2018, covering the Magnetic Properties of Matter 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.