Assertion :Iron, cobalt, nickel and $C r O_{2}$ are called ferromagnetic substances. Reason: Ferromagnetic substances are weakly attracted by magnetic field.

Both Assertion and Reason are correct and Reason is the correct explanation for Assertion

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Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion

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Assertion is correct but Reason is incorrect

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Both Assertion and Reason are incorrect

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Solution

The correct option is C Assertion is correct but Reason is incorrect
Ferromagnetic materials are those which shows very strong attraction in presence of magnetic field. In presence of a magnetizing force, the domains of these materials are so aligned that they produce strong magnetic effects within the part.

Example: $F e, N i, C o, C r O_{2}$

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