| ASSERTION: Cobalt steel cannot be used as permanent magnets. |
| REASON: Permanent magnet should possess a low retentivity and high Coercivity. |
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: D
Solution :
The material used for making a permanent magnet should have high value of coercivity and also high value of retentivity. Also, the area of hysteresis Curve should also be high. Cobalt and steel fulfill at these requirement.
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