Question
If the length of a copper wire is increased by twice, then its resistivity will be
NDA
General Ability
General Science
2025
NDA 2025 (Phase 1)
NDA General Ability Question (2025) — Solution
Options
- A. Doubled
- B. Halved
- C. Same
- D. One-fourth
Answer
C. Same
Step-by-step solution
Resistivity is an intrinsic property of a material. It depends only on the nature of the material and its temperature. It is independent of the physical dimensions such as length and area of cross-section of the wire. Therefore, when the length of the copper wire is increased, its resistivity remains the same. Answer: Same
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