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Assertion To protect any instrument from external magnetic field, it is put inside an iron body. Reason Iron is a magnetic substance.

1. Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
2. Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
3. Assertion is correct but Reason is incorrect
4. Assertion is incorrect but Reason is correct

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

Solution

The assertion is true because iron can shield an instrument by offering an easier path for magnetic field lines, reducing the field inside. The reason is also true, but simply saying iron is magnetic does not explain why it protects; the shielding effect is the real reason.

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