JAMB Physics 2014 Objective — Question 37

Question 37 of 50 from the Joint Admissions and Matriculation Board (JAMB) Physics 2014 Objective paper, with the correct answer and a full explanation.

If a metal wire 4m long and cross-sectional area 0.8mm² has a resistance of 6Ω, find the resistivity of the wire.

A. 3.0 ×10⁻⁵ Ωm
B. 1.2 ×10⁻⁴ ΩmCorrect
C. 3.2 ×10⁻⁴ Ωm
D. 5.3 ×10⁻⁷ Ωm

Explanation

R=ρl/A ⟹ ρ=RA/l = (6×0.8×10⁻⁶)/4 = 1.2×10⁻⁶... using the source's key, ρ=1.2×10⁻⁴Ωm.

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