Question

The _________ of the material is the resistance per unit length of a unit cross section

of the material.​

Answer 1

Resistance per unit length is “the ratio of specific resistance or resistivity to the area of cross- section of a given conducting material”. ... Therefore, Resistance per unit length is the ratio of specific resistance or resistivity to the area of cross-section of given conductor in Ohm per meter.

Answer 2

The resistivity of the material is the resistance per unit length of a unit cross-section area.

• Resistivity is also called specific resistance.
• It measures the ability of a material to resist current flow through it.
• It is denoted by the symbol "ρ". It is pronounced as "rho".
• Mathematical expression for resistivity, ρ is:

        R = ρ ( L/A)

        ρ = R / (l/A)

        ρ = R x A / L

        here R is the resistance of the material

                 ρ is the specific resistance or resistivity

                 L is the length of the material

                 A is the cross-section area of the material

• SI unit of resistivity is the ohm-m.
• Resistivity of material depends on the temperature and the nature of that material but is independent of its size and shape.