A wire of length 15m made of a material of resistivity 1.8 x 10 -6
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
Correct Answer: B. 1.0 x 10-4m2
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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