magnetic properties of materials

Two blocks of different materials are placed in a uniform magnetic field $\mathrm{B}$. The magnetic field lines passing through the two blocks are represented as follows.

Identify the suitable values of relative permeability ${\mu }_r$ and magnetic susceptibility $\chi$ for the materials I and II.

Is Coercivity and Retentivity directly proportional?

Curie temperature is the temperature above which

When Superconductors, are heated above the critical temperature, they expel magnetic field and do not allow the magnetic field to penetrate inside them. 

Explain meissner Effect

Meissner effect is strictly followed by

What is the Meissner effect?

In superconductivity the conductivity of a material becomes

The coils of a superconducting magnet are usually made of niobium _____ in a copper matrix.

In a superconductor, electricity will flow for a long time and then stop.

What are superconducting magnets?

The hysteresis loss in soft magnetic materials must be kept ______

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

Which among the following is not an application of hard ferromagnetic material?

Identify two soft ferromagnetic materials.

List out some applications of hard and soft magnetic materials.

Iron is the best example for hard magnetic material.

What are hard and soft magnetic materials? Give examples.

The relative permeability of iron is $6000$. Its magnetic susceptibility is _____.

Explain origin of diamagnetism on the basis of its atomic structure.