Define the term 'drift velocity' of electrons in a current carrying conductor. Obtain the relationship between the current density and the drift velocity of electrons.

Explain the term 'drift velocity' of electrons in a conductor. Hence obtain the expression for the current through a conductor in terms of 'drift velocity'.

Define the term mobility of charge carriers in a current carrying conductor. Obtain the relation for mobility in terms of relaxation time.

What is drift velocity? Establish a relation between current and drift velocity?

When current is 4 A in a conductor the drift velocity is v_(d) . When the current is 3 A the drift velocity will be

The drift velocity does not depend upon

The drift velocity of free electrons in a conductor is v, when a current i is flowing in it, Ifboth the radius and current are doubled, then the drift velocity will be :

The drift velocity of free elecrons in a conductor is v , when a current i is flowing in it. If both the radius and current are doubled, then the drift velocity wil be

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 ?

Define drift velocity of free electron . If relaxation time is r then write a vector relation b etween drift velocity and electric field.

Define current density. Write an expression which connects current density with drift speed.