Assertion : There is no current in the metals in the absence of electric field.
Reason : Motion of free electron are randomly.

Options

A. If both assertion and reason are ture and reason is the correct explanation of assertion.
B. If both assertion and reason are true but reason is not the correct explanation of assertion.
C. If assertion is true but reason is false.
D. If assertion and reason both are false.

Answer

A

Explanation

(a) It is clear that electrons move in all directions haphazardly in metals. When an electric field field is applied, each free electron acquire a drift velcity. Thee is a net flow of charge, which consitute current. In the absence of electric field this is impossible and hence, there is no currrent.