drift velocity and mobility of electron

What is the drift velocity for the electrons in a calculator when an electric field of strength 200 V//m is applied on it and mobility of electrons is 4.5xx10^(-6) m^(2) V^(-1) s^(-1) ?

A metal wire of length l is connected to an ideal battery of emf V and it is found that drift velocity acquired by the electrons is v_(d) . If the same wire is stretched to double its length then what will be the drift velocity of electrons?

The mobility of electrons is defined as the drift velocity acquird by electrons when a unit electric field is applied. Let a potential diffrence of 120 V be applied across a straight conductor of length 1m. What will be the drift speed of electrons if the mobility of electrons is given to be 6xx10^(-6)m^2V^(-1)s^(-1) ?

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 :

(i) Derive an expression for drift velocity of free electrons. (ii) How many drift velocity of electrons in a metallic conductor vary with increase in temperature ? Explain.

The drift velocity of free electrons in a conductor of length 6 m is 0.25 ms^(-1) under the application of potential difference of 100 V. The mobility of free electrons is

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