In the following questions, a statement of Assertion (A) is given followed by a corresponding statement of Reason (R) just below it. Of the statement mark the correct answer.
(A) : The average thermal velocity of the electrons in a conductor is zero.
(R) : Direction of motion of electrons are randomly oriented.

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Both ‘A’ and ‘R’ are true and ‘R’ is the correct explanation of ‘A’.

‘A’ is false and ‘R’ is true

Both ‘A’ and ‘R’ are true and ‘R’ is not the correct explanation of ‘A’

‘A’ is true and ‘R’ is false

answer is A.

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Detailed Solution

In the absence of the electric current, the electrons in a conductor are in a state of random motion, like molecules in a gas. Their average velocity is zero. i.e. they do not have any net velocity in a direction. As a result, there is no net magnetic force on the free electrons in the magnetic field.

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