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Assertion : The electric bulbs glows imm...

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

A

If both the assertion and reason are true and reason is a true explanation of the assertion.

B

If both the assertion and reason are true but the reason is not the correct explanation of assertion.

C

If the assertion and reason are false

D

If both the assertion and reason are false.

Text Solution

Verified by Experts

The correct Answer is:
C
(c ) In a conductor there are large number of free electrons. When we close the circuit, the elecrtic field is estabilshed instantly with the speed of electromagnetic wave which casue electron drift at every portion of the circuit instantly. The current which is set up does not wait for the electrons flow from one end of the conductor to the another end. It is due to this reason, the electric bulb glows immediatley when switch is on.
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