Physicsmedium · Past Paper
What is the resistivity of a wire if its resistance is 10 Ohms, length is 2 m, and area is 0.5 m^2?
A2.5 Ohm-m
B5.0 Ohm-m
C10 Ohm-m
D40 Ohm-m
✓ Correct Answer: A — 2.5 Ohm-m
Resistivity (ρ) = R * A / L = 10 * 0.5 / 2 = 5 / 2 = 2.5 Ωm.
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