Question

Drift current density increases if​

Answer 1

This combined effect of movement of the charge carriers constitutes a current known as "drift current". Drift current density due to the charge carriers such as free electrons and holes is the current passing through a square centimeter area perpendicular to the direction of flow.

The current density in a conducting wire increases due to an increase in current. The drift velocity is inversely proportional to the current (vd=nqAI), so the drift velocity would decrease

Answer 2

In condensed matter physics and electrochemistry, drift current is the electric current, or movement of charge carriers, which is due to the applied electric field, often stated as the electromotive force over a given distance. When an electric field is applied across a semiconductor material, a current is produced due to the flow of charge carriers.

The drift velocity is the average velocity of the charge carriers in the drift current. The drift velocity, and resulting current, is characterized by the mobility; for details, see electron mobility (for solids) or electrical mobility (for a more general discussion).

See drift–diffusion equation for the way that the drift current, diffusion current, and carrier generation and recombination are combined into a single equation.