A Steady current flows in a metalic conductor of non uniform cross section. The quantity/quantities which remain constant along the length of the conductor is/are

Options

A. Current, electric field, and drift speed
B. Drift speed only
C. Current and drift speed
D. Current only

Explanation

When a steady current flows in a metallic conductor of non-uniform cross section, then drift speed `V_A=I//n_eA` and electric field `E=I//sigmaA or V_d prop 1//A andE prop 1//A` . It implies only current remains is constant.