Assertion :An electric lamp is connected in series with a long solenoid of copper with air core and then connected to an ac source. If an iron rod is inserted in the solenoid, the lamp will become dim. Reason: If an iron rod is inserted in the solenoid, the inductance of the solenoid increases.

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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Assertion is incorrect but Reason is correct

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Solution

The correct option is A Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
$L \propto (\frac{d I}{d t})^{- 1}$
Therefore, upon insertion of an iron rod, inductance of a solenoid increases. The increased inductance inhibits the AC current more and hence lower power to lamp and hence, dimmer lamp.

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