current-electricity Question 9
Question: Q. 10. How does the random motion of free electrons in a conductor get affected when a potential difference is applied across its ends ?
U] [Delhi Comptt. I, II, III 2014]
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Solution:
Ans. The random motion of free electrons gets directed towards the point at a higher potential.
1
Alternatively, The random motion becomes a (partially) directed motion.
OR
It is observed that when a potential difference is applied, drift velocity gets superimposed on thermal velocity as a result of which, the free electrons get drifted towards positive end of conductor and constitute electric current.
[CBSE Marking Scheme 2014]
