Multiple choice

A negligibly small current is passed through a wire of length 15 m and uniform cross-section 6.0 × 10−7 m2 and its resistance is measured to be 5.0 Ω. Then calculate the resistivity of the wire.

  1. 2 × 10−7 Ω.m

  2. 450 × 10−7 Ω.m

  3. 0.5 × 10−7 Ω.m

  4. 0.5 × 107 Ω.m

  5. 18 × 107 Ω.m
Reveal answer Fill a bubble to check yourself
A Correct answer
Explanation

R = ρL/A ρ = R A / L = 5 x 6.0×10−7 / 15 = 2 ×10−7 Ω.m

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