Question

A steady current flows in a metallic conductor of the non-uniform 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

Answer 1

The correct option is D

current only

The explanation for the correct option:

1. When a steady current flows through a non-uniform cross-sectional metallic conductor, the current flowing through the conductor is constant.
2. Since the current is independent of the conductor area, it remains constant.

The explanation for the incorrect options:

1. Current density, electric field, and drift speed are all inversely proportional to cross-sectional area.
2. These quantities are not constant along the length of the conductor.

Hence, Option(D) is correct.