A metallic wire of diameter 0.02m contains 1028 free electrons per cubic meter. Find the drift velocity for free electrons, having an electric current of 100 amperes flowing through the wire.
(Given : charge on electron =` 1.6 xx 10^-19`C)

The number of electrons delivered at the cathode during electrolysis by a current of 1 ampere in 60 seconds is (charge on electron = 1.60 xx 10^(-19)C )

Find the steady curent flowing through a metal wire when 3 xx 10^8 electron pass across a cross-section of the wire in one minute. (Charge on an electron = 1.6 xx 10^-9 C)

A current of 800 mA is passed through an electric lamp for one minute. Find the number of electrons passing through it if the charge of electron is 1.6 xx 10^-19 C.

The magnitude of current density in a copper wire is 500 A//cm^2 . If the number of free electrons per cm^3 of copper is 8.47 xx 10^22 , calculate the drift velocity of the electrons through the copper wire (charge on an e = 1.6 xx 10^-19 C).

A current of 0.2 A passes through a metal wire for 20 seconds. Calculate the number of electrons passing through the cross section of the wire during this time. (The charge on an electron = 1.6 times 10^(-19) C)

Choose correct alternative. A current of 3.2 ampere is flowing in a conductor. The number of electrons per second through the conductor will be [Charge on the electron = 1.6 xx 10^-19 coulomb].

Choose correct alternative. A wire carries a current of 1 A. The number of electrons passing though a cross section of wire per second is ( given : e = 1.6 xx 10^-19 C)

How many electrons need be removed from a metal sphere of 0.05 m radius so that it acquires a charge of 4 xx 10^-15 C ? e = 1.6 xx 10^-19 C.

Solve the following examples (numerical problems): A current of 0.1 A passes through a copper wire for 40 seconds. Find the charge flowing through the cross section of the wire during this time and the number of electrons carrying it. (The charge on an electron, q= -1.6 times 10^(-19) C)