(a) Obtain the expression for drift current in semi conductor materials.
Explanation
The drift current is a result of the movement of charge carriers under the influence of an electric field. The expression for drift current is derived from the equation of motion for charge carriers, which is given by F = qE = m \* dv/dt, where F is the force experienced by the charge carrier, q is the charge of the carrier, E is the electric field, m is the mass of the carrier, and v is the velocity of the carrier.
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