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A wire of length 15m made of a material of resistivity 1.8 x 10-6\(\Omega\)m has...

Physics
JAMB 1992
A wire of length 15m made of a material of resistivity 1.8 x 10-6\(\Omega\)m has a resistance of 0.27\(\Omega\). Determine the area of the wire
  • A. 1.5 x 10-4m2
  • B. 1.0 x 10-4m2
  • C. 2.7 x 10-5m2
  • D. 7.3 x 10-6m2
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Correct Answer: Option B
Explanation
Resistivity = \(\frac{\text {Resiatance x Area}}{length}\)

1.6 x 10-6 = \(\frac{15 \times Area}{0.27}\)

Area = 1.0 x 10-4m2
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