Q.

When no current is passed through a conductor, then

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a

The free electrons do not move.

b

The average speed of a free electron over a large period of time is zero

c

The average velocity of a free electron over a large period of time is zero

d

The average of the velocities of all free electrons at an instant is zero

answer is D, C.

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Detailed Solution

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In the absence of current, electric field inside the conductor is zero. Free electrons have only thermally induced random motion.
Average velocity of a free electron over a long period of time and also average of velocities of all free electrons at an instant is zero.
Options c, d are correct. Options a, b are wrong.

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