Magnetism and M...

Permanent magnets are the substances having the property of

Core of electromagnets are made of ferromagnetic material which have

The hysteresis cycle for the material of a transformer core is:

The temperature of transition from ferromagnetic property to paramagnetic property is called as:

Some equipotential surfaces of the magnetic scalar potential are shown in figure.Magnetic field at a point in the region is

Assertion : When diamagnetic material is placed in a non-uniform magnetic field, it tends to move from stronger to the weaker part of the magnetic field.
Reason : Diamagnetic materials possess strong magnetism.

Assertion : The product of magnetic susceptibility and absolute temperature for a paramagnetic substance is constant.
Reason : Susceptibility is positive but very small for paramagnetic substance.

Nickel shows ferromagnetic property at room temperature. If the temperature is increased beyond Curie temperature, then it will show the

Assertion : When a bar magnet is freely suspended it points in the north - south direction.
Reason : The earth behaves as a magnet with the magnetic field pointing approximately from the geographic south to north

A domain in ferromagnetic iron is in the form of a cube of side length 2$$\mu $$ m then the number of iron atoms in the domain are (Molecular mass of iron = $$55 g mol^{-1}$$ and density = $$7.92 g cm^{-3}$$), maximum value of magnetisation of the given domain is (Dipole moment of an iton atom $$9.27 \times 10^{-24}A m^2)$$