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The resistance of a 5m uniform wire of cross-sectional area 0.2 x 10-6m2 is 0.425....

Physics
JAMB 1989

The resistance of a 5m uniform wire of cross-sectional area 0.2 x 10-6m2 is 0.425. What is the resistivity of the material of the wire?

  • A. 1.10 x 10-6\(\Omega\)m
  • B. 4.25 x 10-6\(\Omega\)m
  • C. 2.40 x 10-7\(\Omega\)m
  • D. 1.70 x 10-8\(\Omega\)m
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Correct Answer: Option D
Explanation

Resistance = \(\frac{\text{ Resistivity x Area}}{Area}\)

= 0.425 x 0.2 x 10-6

= 1.7 x 10-8\(\Omega\)m

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