MCQ
Electrical resistivity MCQ - Practice Questions with Answers
Solve 1 Electrical resistivity questions for RAS/RPSC preparation.
Practice questions
Q1The resistance of a copper wire 200 m long is 21 Ω. If its thickness (diameter) is 0.44 mm, its specific resistance is approximately:
Explanation
Specific resistance is found from rho = RA/L. The diameter is 0.44 mm, so the radius is 0.22 mm, or 0.22 × 10^-3 m. The cross-sectional area is pi r^2, about 1.52 × 10^-7 m^2. Substituting R = 21 Ω and L = 200 m gives rho = 21 × 1.52 × 10^-7 / 200, which is about 1.6 × 10^-8 Ω-m. The other values are lower or higher than this calculation.
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