Question

A steady current flows in a metallic conductor of non-uniform cross-section. Which of the following quantities is constant along the conductor?

• A. Drift Speed
• B. Current Density
• C. Current
• D. None of these

Hint:

Current remains constant in a steady current, but drift speed and current density can vary with changes in the conductor's cross-sectional area.

Answer 1

The Correct Option is C

Step 1: Understand the relationship between current and other quantities.
In a steady current, the amount of charge passing through a cross-section of the conductor per unit time remains constant.
This means the current is the same at all points along the conductor, regardless of its cross-sectional area.
Step 2: Drift speed and current density vary.
Drift speed varies depending on the cross-sectional area of the conductor.

Current density, which is the current per unit area, also varies as the cross-section changes.