| ASSERTION: Electromagnets are made of soft iron. |
| REASON: Coercivity of soft iron is small. |
A) If both assertion and reason are true and reason is the correct explanation of assertion.
B) If both assertion and reason are true and reason is not the correct explanation of assertion.
C) If assertion is true but reason is false.
D) If both assertion and reason are false.
E) If assertion is false but reason is true.
Correct Answer: A
Solution :
Electromagnets are magnets, which can be tamed on and off by switching the Current off and on. As the material in electromagnets is subjected to cyclic changes (magnetization and demagnetization), the hysteresis loss of the material must be small. The material should attain high value of I and B with low value of magnetizing field intensity H. as soft iron has small coercivity, so it is a best choice for this purpose.
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