Current Electricity — Easy JEE physics MCQ
A wire of length 2 m and cross-sectional area 1 mm² has resistivity 1.7 × 10⁻⁸ Ω·m. The resistance of the wire is:
- A. 0.034 Ω
- B. 0.34 Ω
- C. 3.4 Ω
- D. 0.0034 Ω
Solution
Using R = ρL/A = (1.7 × 10⁻⁸ × 2)/(1 × 10⁻⁶) = 3.4 × 10⁻² Ω = 0.034 Ω.