(i) Define the term drift velocity . (ii) On the basis of electron drift , derive an expression for
Channel: Doubtnut
Date: 2020-01-19

(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 ?