A current flows in a wire of circular cross section with the free electrons travelling with drift velocity `vecV`. If an equal current flows in a wire of twice the radius, new drift velocity is

The current i flows in a wire of circular cross-section with the free electrons travelling with a drift velocity v. What is the drift velocity of electrons when a current of 2 i flows in another wire of twice the radius and of the same material ?

In a wire of circular cross-section with radius 'r' free electrons travel with a drift velocity v, when a current I flows through the wire. The current in another wire of half the radius and of the same material when the drift velocity is 2v

In a wire of cross-section radius r , free electrons travel with drift velocity v when a current I flows through the wire. What is the current in another wire of half the radius and of the same material when the drift velocity is 2v ?

In a wire of cross-section radius r, free electrons travel with drift velocity v when a current I flows through the wire. What is the current in another wire of half the radius and of the same material when the drift velocity is 2v?

When current I is made to flow in a wire of radius r, the drift velocity is v_d . If the same current is passed through a wire of radius 2r, then drift velocity will be:

A current I flows through a uniform wire of diameter d when the mean electron drift velocity is v . The same current will flow though a wire of diameter d//2 made of the same material if the mean drift velocity of the electron is

The drift velocity of electrons in a wire of radius r is proportional to

(a) Why do the 'free electrons' , in a metal wire , flowing by themselves' not cause any current flow in the wire ? Define drift velocity' and obtain an expression for the current flowing in a wire, in terms of the 'drift velocity of the free electrons. (b) Use the above expression to show that the 'resistivity ' of the material of a wire is inversely proportional to the 'relaxation time' for the 'free electrons ' in the metal.

A steady current is set up in a metalic wire of non- uniform cross-section. How is the rate of flow free electrons related