Two conducting wires X and Y ,such that diameter of X is half that of Y and the number density of electrons in Y is three times that in X are joined in series across a battery .Find the ratio of drift speed of electron in two wires.

Two conducting wires X and Y of diameter ratio 2 :1 but different materials are joined in series across a battery. If number density of electrons in X is twice that in Y, find the ratio of drift velocity of electrons in the two wires.

Two different wires X and Y of same diameter but different materials are joined in series across a battery. If the number density of electrons in X is twice that in Y, find the ratio of drift velocity of electrons in the two wires .

A conducting wire carrying 1 A of current is connected across a battery of 2V. Find the number of electrons flowing through the wire per second.

Two wires A an dB of the same material, having radii in the ratio I : 2 and carry currents in the ratio 4: I. The ratio of drift speed of electrons in A and Bis :