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JKCET Resistivity — practice questions

Explore 1 free Resistivity questions in JKCET Physics. Open each question or exercise to read its content, reference answers and available explanation.

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Resistivity questions and exercises with answers

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The specific resistance ρ of a metre-bridge wire of length 1 m, diameter 0.12 cm and resistance 1.49 Ω is approximately:Read the answer and worked solution →

Worked practice questions

The specific resistance ρ of a metre-bridge wire of length 1 m, diameter 0.12 cm and resistance 1.49 Ω is approximately:

  1. $1.68 \times 10^{-6}$ Ω·m
  2. $1.49 \times 10^{-2}$ Ω·m
  3. $1.49 \times 10^{-6}$ Ω·m
  4. $1.68 \times 10^{-4}$ Ω·m
Show answer and solution

Correct answer: A. $1.68 \times 10^{-6}$ Ω·m

$\rho = R\pi r^2/L = 1.49 \times \pi \times (0.06\times10^{-2})^2/1 \approx 1.68\times10^{-6}$ Ω·m. Typical of a metallic alloy like manganin/constantan.

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