Compare the drift speed obtained above with:
speed of propagation of electric field along .the conductor which causes the drift motion.

Compare the drift speed obtained above with (a) thermal speed of electrons carrying the current at room temperature and (b) speed of propagation of electric field along the conductor which causes the drift motion.Avogadro's number= 6.0 times 10^26 per kg atom. Boltzmanm constant , k=1.38 times 10^-23 J.K^-1 mass of electron =9.1 times 10^-31 kg .

Compare the drift speed obtained above with: thermal speeds of copper atoms at ordinary temperatures

A long round conductor of cross-sectional area A is made of a material whose resistivity depends only on the distance r from the axis of the conductor as p=alpha/r^2 where a is alpha constant. Find (a) the resistance per unit length of such a conductor, (b) the electric field strength in the conductor due to which a current I flows through it.

Statement I: A current flows in a conductor only when there is an electric field within the conductor. Statement II: The drift velocity of electron decreases in presence of electric field.

Write the expression for the force vecF acting on a particle of charge q moving with a velocity vecv in the prensnece of both electric field vecE and magnetic field vecB . Obtain the condition under which the particle moves undeflected through the fields.