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Home Questions GAEYQCDHJJ
Target Exam

CUET

Subject

Physics

Chapter

Current Electricity

Question:

Assertion (A) : The electric bulb glows immediately when switched on.

Reason (R) : The drift velocity of electrons in metallic wire is very high.

Options:

Both (A) and (R) are true and (R) is the correct explanation of (A).

Both (A) and (R) are true but(R) is NOT the correct explanation of (A).

(A) is true but (R) is false.

 

Both (A) and (R) are false.

Correct Answer:

(A) is true but (R) is false.

 

Explanation:

In a conductor there are large number of free electrons. When we close the circuit, the electric field is established instantly with the speed of electromagnetic wave which cause electron drift at every portion of the circuit. Due to which the current is set up in the entire 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 immediately when switch is on.

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