JAMB Physics 2025 Objective — Question 4
Question 4 of 40 from the Joint Admissions and Matriculation Board (JAMB) Physics 2025 Objective paper, with the correct answer and a full explanation.
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A wire of length 10 m, cross-section 2 mm² has resistance 0.5 Ω. What is the resistivity?
- A. 1×10⁻⁷ ΩmCorrect
- B. 1.5×10⁻⁶ Ωm
- C. 0.1 Ωm
- D. 2.33×10⁻⁵ Ωm
Explanation
ρ=RA/l=(0.5×2×10⁻⁶)/10=1×10⁻⁷ Ωm.
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