Post-UTME Physics 2011 Objective — Question 9
Question 9 of 10 from the Post-UTME Screening (Post-UTME) Physics 2011 Objective paper, with the correct answer and a full explanation.
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A wire of length 15m made of a material of resistivity 1.8×10⁻⁶Ω·m has a resistance of 0.27Ω. Determine the area of the wire
- A. 1.5×10⁻⁴
- B. 1.0×10⁻⁴m²Correct
- C. 2.7×10⁻⁵
- D. 7.3×10⁻⁶m²
Explanation
A=ρL/R = (1.8×10⁻⁶×15)/0.27 = 1.0×10⁻⁴m².
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