Question

Electromagnetic are made of soft iron. Coercivity of soft iron is small

• A. If both Assertion and Reason are correct and Reason is the correct explanation of Assertion.
• B. If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.
• C. If Assertion is correct but Reason is incorrect
• D. If both the Assertion and Reason are incorrect

Answer 1

Answer: (B)

If both Assertion and Reason are correct, but Reason is not the correct explanation of Assertion.

Answer 2

Electromagnets are magnets, which can be turned on and off by switching the current on and off. As the material in electromagnets is subjected to cyclic changes (magnification and demangetisation), the hysteresis loss of the material must be small. The material should attain high value of I and B with low value of magnetising field intensity H. As soft iron has small coercivity, so it is a best choice for this purpose.