SI unit of resistivity is _

Explanation

Resistivity (ρ) is a fundamental property of materials that quantifies how strongly a material opposes the flow of electric current. It is given by the equation ρ = RA/L, where R is resistance, A is cross-sectional area, and L is length. Substituting the respective units, we get ρ = Ω × m²/m = Ωm, making Ωm the correct SI unit for resistivity.Option A (Ω-m2) is incorrect because it is not a recognized unit for resistivity. Option B ((Ω-m)-1) is incorrect as it represents the unit of conductivity, the reciprocal of resistivity. Option D ((Ω-m)-2) is incorrect since it does not correspond to any meaningful electrical property.