Assertion: A current flows in a conductor only when there is an electric field within the conductor:
Reason: The drift velocity of electron in presence of electric field decreases.

Options

A. Both A and R are true and R is also the correct explanation of A .
B. Both A and R are true but R is not the correct explanation of A.
C. A is true but R is false.
D. A is false and R is also false.

Answer

B