Assertion :An electrical bulb starts glowing instantly as it is switched on. Reason: Drifty speed of electrons in a metallic wire is very large.
A
Both Assertion and Reason are correct and Reason is the correct explanation for Assertion
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B
Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
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C
Assertion is correct but Reason is incorrect
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D
Both Assertion and Reason are incorrect
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Solution
The correct option is C Assertion is correct but Reason is incorrect As the conductor is full of electrons, with slight drift anywhere the queue starts moving. As a result bulb starts glowing instantly. Drift velocity of electrons in a good conductor is very low.