Question

What is specific resistance ? What is its unit ?

Answer 1

The resistivity (or specific resistance) of a material is the resistance of a conductor (of the material) of unit length and unit area of cross-section.

Numerically, the resistivity of a material is the resistance offered by a cube of the material with sides of unit length when a current flows through its opposite faces.

We have, ρ = RA/l

∴ SI unit of ρ=ohm.metre ² /metre=ohm.metre