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Calculate the resistivity of a wire of length 2m and cross-sectional area 0.004cm2 if the...

Physics
WAEC 1988
Calculate the resistivity of a wire of length 2m and cross-sectional area 0.004cm2 if the resistance is 3.0 Ω.
  • A. 0.0000267Ωcm
  • B. 0.006Ωcm
  • C. 0.26700Ωcm
  • D. 0.27500Ωcm
  • E. 0.060000Ωcm
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Correct Answer: Option B
Explanation
R = αL/A
P = RA/L = (3 x 0.004)/2 = 0.006
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