Assertion :A soft iron core is used in a moving coil galvanometer to increase the strength of magnetic field. Reason: From soft iron more number of the magnetic lines of force passes.

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 A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
Soft iron is ferromagnetic in nature and hence which helps in strengthening of the magnetic field lines in the core as the number of the lines are increased in the core. This is helpful in increasing the sensitivity of the moving coil galvanometer

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