MHT CET20255 May 2025Evening ShiftChemistryElectrochemistryActual
What is the SI unit of resistivity?
Options
- Am
- Bm ⁻¹
- C⁻¹ ~m ⁻¹
- Dm ⁻²
Correct answer
A. m
Step-by-step solution
The resistance R of a conductor follows the relationship R = L A , where represents resistivity, L is length, and A is cross-sectional area. Solving for resistivity yields = R A L . Substituting SI units: for resistance, m ^2 for area, and m for length, we obtain m ^2 m = m . The SI unit of resistivity is ohm-meter ( m ). Among the options, only choice A correctly represents this unit.