Q
When the length of a wire is doubled while keeping material and area of cross-section constant, what happens to its resistance?
RRB Group D
18 Aug, 2026 (9:00 AM - 10:30 AM)
2026
✓ Answer:
B
The resistance becomes twice as much
Since R = ρL/A and material and area are unchanged, resistance is directly proportional to length. Doubling the length doubles R.