JEE Main 2004 — Magnetic Properties Of Matter Question with Solution
From: AIEEE 2004
Question
Choose an option
Show full solutionCorrect option: B
Step-by-step explanation
Materials suitable for making electromagnets should have low retentivity and low coercivity.
Retentivity (or remanence) is the ability of a magnetic material to retain its magnetism after the removal of the magnetizing force. For an electromagnet, we want this to be low, as we want the magnet to only be magnetic when current is flowing.
Coercivity is the ability of a magnetic material to resist becoming demagnetized. Again, for an electromagnet, we want this to be low, as we want to easily turn off the magnetism when the current is removed.
So, the correct option is :
Option B: Low retentivity and low coercivity.
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This is a previous-year question from JEE Main 2004, 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.