Question

three wires are of the same material but different lengths and area of cross section. will their resistivities be same or different? explain

Answer 1

Yes, their resistivity will remain the same as resistivity of a wire depends upon the material used to make it, which is same for all the wires here.

Answer 2

Answer:

the resistance will change

Explanation:

R=ρ(L/A)

where ρ = resistivity of the material used

l=length of the wire

A= area of cross section

here R∝L/A or R∝L and R∝1/A

which means that the R of the wire is directly proportional to the length of the wire and inversely proportional to the area of cross section.

Therefore we can say that the resistance changes with the change in length and the area of cross section of the wire