Assume that each atom in a copper wire contributes one free electron. Estimate the number of free electrons in a copper wire having a mass of 6.4g (take the atomic weight of copper to be 64g `mol^(-1)).`

Assme that each of copper atom has one free electron estimate the number of free electrons in 1 mg of copper. Given that atomic weight of copper 63.5 and Avogadro number = 6.02 xx 10^23 . What is the charge possessed by these free electrons?

Copper cystalizes in a face centred cubic lattice. Calculate the number of unit cells in 12g of copper (atomic mass of copper =63.5u).

An aluminium wire of diameter 0.24 cm is connected in series to a coper wire of diamater 0.16 cm. The wires carry n electric current of 10 A. Find drift velocity of electrons in the copper wire. Given that number of density of free electrons in copper = 8.4 xx 10^28m^-3 .

Two copper wires, one of length 1 m and the other of length 9 m, are found to have the same resistance. Their diameters are in the ratio

Assuming that the charge of an electron is 1.6 xx 10^-19C , the number of electrons passing through a section of wire per second, when the wire carries a current of 1 A is

Estimate the number of free electrons in 1 g of water and the negative charge possessed by the. Given that Avogadro number = 6.02 xx 10^23 and molecular weight of water = 18

A copper wire 3 mm in diameter is wound about a cylinder whose length is 12 cm, and diameter 10 cm,so as to cover the curved surface of the cylinder. Find the length and mass of the wire, assuming the density of copper to 8.88 g per cm^3 .

A circular coil of 20 turns and radius 10 cm is placed in a uniform magnetic field of 0.10 T normal to the plane of the coil. If the current in the coil is 5.0 A, what is the average force on each electron in the coil due to the magnetic field? (The coil is made of copper wire of cross-sectional area 10^-5 m^2 , and the free electron density in copper is given to be about 10^29 m^-3 .)