A) If both the assertion and reason are true and reason explains the assertion.
B) If both the assertion and reason are true but reason does not explain the assertion.
C) If assertion is true but reason is false.
D) If assertion is false but reason is true.
Correct Answer: A
Solution :
It is clear that electrons move in all direction haphazardly in metals. When an electric field is applied, each free electron acquire a drift velocity. These is a let flow of charge, which constitute, current. In the absence, if electric field this is impossible, and hence, these is no current.
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