A steady current flows in a metallic conductor of nonuniform cross-section. The quantity/ quantities constant along the length of the conductor is/are

A
current, electric field and drift speed
B
drift speed only
C
current and drift speed
D
current only

Solution:

If E is the electric field, then current density $j = σ E$ Also we know that current density $j = \frac{i}{A}$

Hence j is different for different area of cross-sections. When j is different, then E is also different. Thus E is not constant. The drift velocity $v_{d}$ is given by $v_{d} = \frac{j}{n e}$ (different for different j values), Hence, only current will be constant.

Solution:

Related content