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JAMB Physics 1992 Question 36

Question 36

Current Electricity

A wire of length 15m made of a material of resistivity 1.8 × 10−6 Ω m has a resistance of 0.27Ω. Determine the area of the wire

  1. A.1.5 × 10−4 m2
  2. B.1.0 × 10−4 m2
  3. C.2.7 × 10−5 m2
  4. D.7.3 × 10−6 m2.
Show the answer and explanation

Answer: B (1.0 × 10−4 m2)

Explanation

R = ρL/A, so A = ρL/R = 1.8 × 10−6 × 15 ÷ 0.27 = 1.0 × 10−4 m2.