alleryResistance R of a uniform wire of length L and cross-sectional area A is:
AR = ρ L A
BR = ρ L / A
CR = ρ A / L
DR = A / (ρ L)
Answer & Solution
Correct answer: B. R = ρ L / A
1. R = ρ L / A, with ρ the resistivity (Ω·m).
2. Longer wires have more resistance; thicker wires have less.
3. Resistivity is an intrinsic material property.
_Source: syllabus Science Ch 11 §11.4 Resistance of a Conductor_
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