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.

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

Assertion : Current flows in a conductor only when there is an external electric field within the conductor. Reason: The drift velocity of the electrons is directly proportional to the electric field.

Assertion : Current flows in a conductor only when there is an external electric field within the conductor. Reason: The drift velocity of the electrons is directly proportional to the electric field.

The average velocity of electrons in a conductor in the absence of electric field is

The average velocity of electrons in a conductor in the absence of electric field is

A steady current is flowing in a cylindrical conductor. Is there any electric field within the conductor ? If yes, what is its relation with current density?