Question

10) What is resistivity? Derive its expression.
​

Answer 1

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.Resistivity, commonly symbolized by the Greek letter rho, ρ, is quantitatively equal to the resistance R of a specimen such as a wire, multiplied by its cross-sectional area A, and divided by its length l; ρ = RA/l. The unit of resistance is the ohm.

Answer 2

Answer:-

The electrical resistivity is the electrical resistance per unit lenght and per unit of cross sectional area at a specific temperature. the si unit of electrical resistivity is the ohm metre .it is commonly by the Greek letter p ,rho.

hope it's help you..❣