Prove that the current density of a metallic conductor is directly proportional to the drift speed of electrons.

The strength of photoelectric current is directly proportional to :

If the physical state of the conductor remains unchanged then the current through the conductor is directly proportional to potential difference between the ends of a conductor. This is the statement of

Assertion: For good conductors, the I-V graph is a perfect straight line inclined to current axis. Reason: By Ohm's law, voltage across the ends of a conductor is directly proportional to the resistance of the conductor.

The magnetic field at a point due to a current carrying conductor is directly proportional to

A conductor has density d and molar mass M . A wire made of this conductor has cross sectional radius r . Calculate the drift speed of electrons in this conductor when current through it is I . Assume that each atom contributes one free electron.

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.