Understanding magnetic properties of matter

The figure gives experimentally measured B vs. H variation in a ferromagnetic material. The retentivity, coercivity, and saturation, respectively, of the material, are :

For substances, hysteresis curves are given as shown in the figure. For making temporary magnets, which of the following is best.

The direction of the magnetic field line in case of a bar magnet at point A & B are

A circular loop of area rotates in a uniform magnetic field of 0.2 T. If the loop rotates about its diameter which is perpendicular to the magnetic field. Find the magnetic flux linked with the loop when its plane is normal to the field.

The coercivity of a magnet is . What current should be passed through a solenoid of length 10 cm and the number of turns 50 that the magnet is demagnetized when inserted in it?

Find the flux contained by the material when the flux density is 11.7 Tesla and the area is .

A bar magnet has a coercivity of . It is placed inside a solenoid of length 12 cm having 60 turns in order to demagnetize it, the amount of current that should be passed through the solenoid is:

The B-H curve for a ferromagnet is shown in the figure. The ferromagnet is placed inside a long solenoid with 1000 turns/cm. The current that should be passed in the solenoid to demagnetize the ferromagnet completely is:

A magnetizing field of produces a magnetic flux density (B)=0.6T in a ferromagnetic material. What is its permeability in ?

A bar magnet is demagnetized by inserting it inside a solenoid of length 0.2m,100 turns, and carrying a current of 5.2A. The coercivity of the bar magnet is:

In the Hysteresis cycle, the value of H needed to make the intensity of the magnetism zero is called.

The use of the study of hysteresis curve for a given material is to estimate the

Identify which of the following is the unit of magnetic flux density?

The magnetic lines of force due to a bar magnet are:

The magnetic materials follow which law?