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The resistivity, \(\mathit{P}\), of a material of length l, cross-sectional area A, resistance R, is...

Physics
WAEC 2011

The resistivity, \(\mathit{P}\), of a material of length l, cross-sectional area A, resistance R, is given by the equation

  • A. \(\mathit{P} = \frac{RA}{l}\)
  • B. \(\mathit{P} = \frac{l}{RA}\)
  • C. \(\mathit{P} = \frac{Rl}{A}\)
  • D. \(\mathit{P} = \frac{R}{Al}\)
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Correct Answer: Option A
Explanation

 resistivity P  is directly proportional to the product of resistance and cross-sectional area and inversely proportional to the length of the wire

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