A) drift velocity of electron increases when switch is closed
B) electrons are accelerated towards the negative end of the conductor
C) the drifting of electrons takes place at the entire length of the conductor
D) the electrons of conductor move towards the positive end and protons of conductor move towards negative end of the conductor
Correct Answer: C
Solution :
(c) the drifting of electrons takes place at the entire length of the conductor When we close the circuit, an electric field is established instantly with the speed of electromagnetic wave which causes electrons to 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 electrons to flow from one end of the conductor to another. Thus, the electric bulb glows immediately when switch is closed.
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