The area of B - H loop for a ferromagnetic material is `540 J m^-3`. If the absolute permeability of free space is `4pi xx 10^-7 J A^-2 m^-1`, find the area of the I - H loop of the ferrogmangnetic material.

In S.I, the absolute permitivity of free space mu=4pixx10^-7 TA^-1m . (True/ false)

A transformer is working on 220V.50 Hz a.c. supply. The iron core of the transformer has a mass of 8.4 kg.. From the plot of B-H loop for the core, it is found that area of hte loop is 480 J m^-3 . If the density of iron is 7,500 kgm^-3 , find the loss of energy in the core of transformer in 1 hour.

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 I=3.36 (1+2t)xx 10^-2 A increases at a steady rate in a long straight wire. A small circular loop of radius 10^-3 m has its plane parallel to the wire and is at a placed at a distance of 1 m from the wire. The resistance of the loop is 8.4 xx 10^-4 Omega . find the megnitude and the direction of the induced current in the loop.

If absolute permittivity and permeability of free space are epsilon_0 = 8*85 xx 10^(-12) C^2 N^(-1) m^(-2) and mu_0 = 4 pi xx 10^(-7) N s^2 C^(-2) .Caculate the velocity of electromagnetic waves?

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 relative permeability of the material.

A current of 5A is passing through a metallic wire of area of cross-section 4xx10^-6m^2 , If the density of charge carriers of the wire is 5xx10^26m^−3 find the drift velocity of electrons.

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 permeability

A wire having a mass of 0.45 kg posseses a resistanfce of 0.014 Omega . If the resistivity of the material fo wire is 1.78 xx10^-7 Omegam , calculate its length and radius. Given that the density of the material of wire is 8.93 xx10^3 kg m^-3

A current of 10A is maintained in a conductor of cross-section 10^-4m^2 . If the number density of free electrons be 9 xx 10^28 m^-3 , calcualte the drift velocity of free electrons. Given, charge on electron, e = 1.6 xx 10^-19C