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Question: Answered & Verified by Expert
Assertion : An electrical bulb starts glowing instantly as it is switched on.
Reason : Drift speed of electrons in a metallic wire is very large.
PhysicsCurrent ElectricityAIIMSAIIMS 2017
Options:
  • A If both assertion and reason are true and reason is the correct explanation of assertion.
  • B If both assertion and reason are true but reason is not the correct explanation of assertion.
  • C If assertion is true but reason is false.
  • D If both assertion and reason are false.
Solution:
1493 Upvotes Verified Answer
The correct answer is: If assertion is true but reason is false.
As the conductor is full of electrons, with slight drift anywhere the queue starts moving. As a result bulb starts glowing instanty. Drift velocity of electrons in a good conductor is very low.

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