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$What is the SI unit of electrical resistivity ρ ?$

A. $Ω$
B. $Ω \cdot m$
C. $Ω/ m$
D. $S$

Show correct answer & step-by-step solution

Correct answer: B — $Ω \cdot m$

Solution

From R = ρ \frac{L}{A}, we have ρ = R \frac{A}{L} . The units are Ω \cdot \frac{m ^{2}}{m} = Ω \cdot m .

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