Assertion : The electric bulb glows immediate | vedclass

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(C) In a conductor,there are a large number of free electrons. When we close the circuit,an electric field is established instantly throughout the con

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If Assertion is correct but Reason is incorrect.

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(C) In a conductor,there are a large number of free electrons. When we close the circuit,an electric field is established instantly throughout the conductor at the speed of electromagnetic waves (approximately $3 	imes 10^8 \ m/s$).This electric field exerts a force on all free electrons simultaneously,causing them to drift.Consequently,the current is established in the entire circuit instantly.The current does not depend on the time taken for an individual electron to travel from one end of the conductor to the other.The drift velocity of electrons is actually very small (typically in the order of $10^{-4} \ m/s$).Therefore,the Assertion is correct,but the Reason is incorrect.

Assertion : The electric bulb glows immediately when the switch is on.
Reason : The drift velocity of electrons in a metallic wire is very high.

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Assertion : The electric bulb glows immediately when the switch is on.Reason : The drift velocity of electrons in a metallic wire is very high.