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NEET2017PhysicsCurrent ElectricityActual

Assertion : An electrical bulb starts glowing instantly as it is switched on. Reason : Drift speed of electrons in a metallic wire is very large.

Options

  1. AIf both assertion and reason are true and reason is the correct explanation of assertion.
  2. BIf both assertion and reason are true but reason is not the correct explanation of assertion.
  3. CIf assertion is true but reason is false.
  4. DIf both assertion and reason are false.

Correct answer

C. If assertion is true but reason is false.

Step-by-step solution

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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