S.I unit of electric resistivity is  

The correct answer is ohm-meter.

Explanation:

• The SI unit of electric resistivity is the ohm-meter (Ω-m).
• The electrical resistance per unit length and per unit of cross-sectional area at a specified temperature is called resistivity.
• It is the property of the material.
• A low resistivity indicates a material that readily allows the flow of electric current.
• The resistivity is given by the following formula, 
• \({\text{ρ}} = \frac{{{\text{RA}}}}{{{\text{L}}}}\)
• Where:
• ρ is the resistivity of the material.
• R is the electrical resistance of the material.
• A is the cross-sectional area of the material.
• L is the length of the material.

Thus, S.I unit of electric resistivity is ohm-meter.