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Assertion: Electromagnets are made of so...

Assertion: Electromagnets are made of soft iron.
Reason: Coercivity of soft iron is small.

A

Assertion is correct, reason is correct, reason is a correct explanation for assertion.

B

Assertion is correct, reason is correct, reason is not a correct explanation for assertion

C

Assertion is correct, reason is incorrect

D

Assertion is incorrect, reason is correct

Text Solution

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The correct Answer is:
B
Electromagnetsaremagnets, which can be turnd on and off by switching the current on and off.
As the material in electromagnets is subjectedtocyclicchanges(magnification and demangetisation), the hysteresis loss ofthematerialmustbesmall. Thematerial shouldattainhigh valueofIand Bwithlow value of magnetising field intensity H. As softironhassmallcoercivity,soitisabest choice for this purpose.
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