A) Both Assertion (A) and Reason (R) are true and Reason (R) is the correct explanation of Assertion (A)
B) Both Assertion (A) and Reason (R) are true but Reason (R) is not the correct explanation of Assertion (A)
C) Assertion (A) is true but Reason (R) is false
D) Assertion (A) is false and Reason (R) is also false
Correct Answer: C
Solution :
(c) Consider a conductor of length I and area of cross-section A. Time taken by the free electrons to cross the conductor, \[t=l/{{v}_{d}}\]. Hence, current, \[l=\frac{q}{t}=\frac{Al\times ne}{l/{{v}_{d}}}\] Or \[l=Ane{{v}_{d}}\] Or \[l\propto {{v}_{d}}\] Thus current is directly proportional to drift velocity.
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