Assume that each iron atom has a permanent magnetic moment equal to 2 Bohr magneton . The number density of atoms in iron is `8.52 xx 10^28 m^-3`. Find the maximum value of magnetic induction in an iron bar.

Assume that each iron atom has a permanent magnetic moment equal to 2 Bohr magneton . The number density of atoms in iron is 8.52 xx 10^28 m^-3 . Find the maximum value of intensity of magnetisation.

A magnet weighs 75 g and its magnetic moment is 2xx10^-4 A m^2 . If the density of the material of the magnet is 7.5 xx 10^3 kg m^-3 , calculate the intensity of magnetisation.

A current of 1.8 A flows through a wire of cross-sectional area 0.5 mm^(2) ? Find the current density in the wire. If the number density of conduction electrons in the wire is 8.8 xx 10^(28) m^(-3) , find the drift speed of electrons.

What is the electric potential at the surface of an iron nucleus? The radius of the nucelus is 4.2 xx 10^-15 m and the atomic number is 26.

A paramagnetic gas consists of atoms each with a dipole moment of 1.5 xx 10^-23 j T^-1 . The temperature of the gas is 27^@C and its number density is 2xx10^26 m^-3 . What is the maximum magnetisation of the sample possible, when it is placed in an external magnetic field?

A rheostat has 100 turns of a wire of radius 0.4 mm having resistivity 4.2 xx 10^-7Omega m. The diameter of each turn is 3 cm. What is the maximum value of resistance it can introduce?

The magnetic induction and magnetising field in a sample of magnetic material are 1.0 Wb m^-2 and 2 xx 10^3 A m^-1 respectively. Find magnetic susceptibility

A current of 2.4 A flows through a wire of cross-sectional area 1.5 mm^2 . Find the current density in the wire. If the wire contains 8 xx 10^28m^-3 elecrtrons per unit volume calculate the average relaxation on time. Given that charge on electron = 1.6 xx 10^-19C and mass of electron =9.1 xx 10^-31 kg.