| Assertion: Soft iron is used as a core of transformer. |
| Reason: Area of hysteresis for 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 :
The alternating current flowing through the coils, magnetizes and demagnetizes the iron core again and again over complete cycles. During each cycle of magnetization, some energy is lost due to hysteresis, the energy lost during a cycle of magnetization being equal to area of hysteresis loop (in magnitude). Energy loss can be reduced by selecting the material core, which has narrow hysteresis loop, that is why soft core is used.
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