The mechanism of the heat produced in a conductor when an electric current flows through it can be explained on the basis of

The drift velocity of free electrons in a conductor is $v$ when a current $i$ is flowing in it. If both the radius and current are doubled,then the drift velocity will be

What is relaxation time?

On increasing the temperature of a conductor,its resistance increases because

Derive the relation between electric current and drift velocity.

The drift velocity of electrons for a conductor connected in an electrical circuit is $V_{d}$. The conductor is now replaced by another conductor of the same material and same length but with double the area of cross-section. The applied voltage remains the same. The new drift velocity of electrons will be