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JEE PHYSICS MCQ: CURRENT ELECTRICITY
1
Medium
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Understanding
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When no electric field is present.
I. The electrons will be moving due to thermal motion during which they collide with the fixed ions.
II. An electron colliding with an ion emerges with the same speed as before the collision.
However the direction of its velocity after the collision is completely random.
III. At a given time, there is no preferential direction for the velocities of the electrons.
Thus, on an average, the number of electrons travelling in any direction will be equal to the number of electrons travelling in the opposite direction. So, there will be no net electric current.
Which of the above statements are correct?
I. The electrons will be moving due to thermal motion during which they collide with the fixed ions.
II. An electron colliding with an ion emerges with the same speed as before the collision.
However the direction of its velocity after the collision is completely random.
III. At a given time, there is no preferential direction for the velocities of the electrons.
Thus, on an average, the number of electrons travelling in any direction will be equal to the number of electrons travelling in the opposite direction. So, there will be no net electric current.
Which of the above statements are correct?
View answer and explanation
Correct option: D
I, II and III
Option D (I, II and III) is correct because all three statements accurately describe the behavior of electrons in a conductor when no electric field is present.
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