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The resistance of a conductor is directly proportional to its ________.
- Area of cross-section
- Length
- Temperature
- Both length and temperature
Answer: Length
R = ρL/A: resistance ∝ length (L), ∝ resistivity (ρ), ∝ 1/area (A). Temperature increases ρ for metals. Fundamental for circuit design. [[NCERT Physics Class 10]]