Question

what is resistivity? derive an expression for the same​

Answer 1

Resistivity, electrical resistance of a conductor of unit cross-sectional area and unit length.

Answer 2

Answer:

Resistivity is defined as the resistance offered by the material per unit length for unit cross-section. The SI unit of resistivity is Ohm.meter. Resistivity increases linearly with temperature. The resistivity of conductors is low when compared to the resistivity of the insulators. Therefore, it can be represented as:

Resistivity of conductors < Resistivity of alloys < Resistivity of insulators.