[" 19.Derive an expression for the resistivity of a good "],[" conductor in terms of the relaxation time of "],[" electrons."]

Derive an expression for drift velocity of free electrons in a conductor in terms of relaxation time.

Resistivity of a material of conductor in terms of relaxation time is given by

Write the expression for thermal resistance of a conductor

Explain how the resistivity of a conductor depends upon relaxation time tau ?

(i) Define the term drift velocity . (ii) On the basis of electron drift , derive an expression for resistivity of a conductor in terms of number density of free electrons and relaxation time. On what factors does resistivity of a coductor depend ? (iii) Why alloys like constantan and manganin are used for making standard restores ?