AIIMS 2017
- Exam
- AIIMS
- Year
- 2017
- Subject
- Physics
- Chapter
- Current Electricity
AIIMS 2017 · Physics · Current Electricity
Assertion : An electrical bulb starts glowing instantly as it is...
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
- AIf both assertion and reason are true and reason is the correct explanation of assertion.
- BIf both assertion and reason are true but reason is not the correct explanation of assertion.
- CIf assertion is true but reason is false.
- 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.