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Question
Assertion :Free electrons always keep on moving in a conductor even then no magnetic force act on them in magnetic field unless a current is passed through it. Reason: The average velocity of free electron is zero.
Assertion :Free electrons always keep on moving in a conductor even then no magnetic force act on them in magnetic field unless a current is passed through it. Reason: The average velocity of free electron is zero.
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Solution
The correct option is B Both Assertion and Reason are correct but Reason is not the correct explanation for Assertion
In the absence of the electric current, the force electrons in a conductor are in a state of random motion, like molecule 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. On passing the current, the free electrons acquire drift velocity in a definite direction, hence magnetic force acts on them, unless the field has no perpendicular component.
In the absence of the electric current, the force electrons in a conductor are in a state of random motion, like molecule 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. On passing the current, the free electrons acquire drift velocity in a definite direction, hence magnetic force acts on them, unless the field has no perpendicular component.
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