Question

Factors on which the resistance of a wire depends upon

Answer 1

As we know,

R=rho*l/A ; where rho is resistivity,l is length of the coil and A is the area of cross section.

Also,

Rho = m/(ne^2T) ; where m denotes mass, n is number of electrons, e is the charge on a electron and T is average relaxation time.

So now, we can conclude that

Resistance depends upon -

1) Nature of material of conductor

2) Temperature(directly proportional)

3) Length of coil(directly proportional)

3) Area of cross section(inversely proportional)

4) Electron density(inversely proportional)

5)Average Relaxation time(inversely proportional)

Hope this helps :)