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Four pieces of constantan wire, marked E, F, G, and H, each of length 1.0m,...

Physics
WAEC 2024

Four pieces of constantan wire, marked E, F, G, and H, each of length 1.0m, are at the temperature. Their respective diameters are 1 mm, 2 mm, 6 mm, and 10 mm. Which wire has the highest resistance?

  • A. E
  • B. F
  • C. G
  • D. H
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Correct Answer: Option A
Explanation

Using the equation, R = \(\frac{\rho l}{A}\)

we conclude that the wire with the smallest diameter will have the highest resistance i.e. wire E


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