How does resistivity depend on number density of electrons?

Define the term resistivity and write its S.I. unit. Derive the expression for the resistivity in terms of number density of free electrons and relaxation time.

Explain how the resistivity of a conductor depends upon number density 'n' of free electrons?

How does strain depend on stress?

Explain how does resistivity of a conductor depend upon number density n of free electron relaxation time tau ?

How does the mean free path depend on the number density of molecules?

How does electrical resistance depend on the area of cross-section of a conductor?

(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 ?

Answer the following: (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 ?