Question

A wire has a non-uniform cross-sectional area as shown in figure. A steady current i flows through it. Which one of the following statement is correct

• A. The drift speed of electron is constant
• B. The drift speed increases on moving from A to B
• C. The drift speed decreases on moving from A to B
• D. The drift speed varies randomly

Answer 1

Answer: (C)

The drift speed decreases on moving from A to B

Answer 2

For a conductor of non-uniform cross-section $v _ { d } \propto \frac { 1 } { \text { Area of cross - section } }$