Question

how does the resistivity vary with the length of the conductor
please answer the correct question​

Answer 1

Answer:

Explanation:

As we have formula for Resistance i,e

                           R = ρ x L/A

where     R = Resistance of conductor

                ρ = Resistivity of the Material of conductor ( every element has     a fixed value of resistivity for example SILVER has Resistivity of 1.59 x 10-^8 ohm m)

                L  = Length of Conductor

                A = Area of cross-section of Conductor

so, if we write above equation in terms of Length we will get.

                              L = (R x A)/ρ

                              L  is directly proportional to the AREA and RESISTANCE  , Resistivity is a value which is independent of the physical shape and size  of the Conductor , only Resistance very with change in shape and size .