What is the resistance of a 20 cm long wire?
GeneralClass 12AllAnswered 27 Mar 2026
Answer
To calculate the resistance of a 20 cm long wire, you need additional information:
Reuired parameters:
- Material (determines resistivity, ρ)
- Cross-sectional area or diameter
Formula: R = ρL/A
Example: A 20 cm (0.2 m) copper wire with 1 mm² cross-sectional area has: R = (1.68 × 10⁻⁸ × 0.2)/(1 × 10⁻⁶) = 0.00336 Ω or 3.36 mΩ
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