Magnetism and M...

In Ferromagnetic materials

Permanent magnets should have

For strong electromagnets, core is made of

The angle of dip at a location in southern India is about 18^o. Dip angle in Britain would be

If you made a map of magnetic field lines at Melbourne in Australia, would the lines go into the ground or come out of the ground?

To increase the magnetic field of a solenoid what core material should be used?

If the area under the B-H curve of a material M is more, in an ac solenoid using material M

If we wanted to cancel the Earth’s magnetic field by running an enormous current loop around the equator, which way would the current have to flow: or west to east?

Assuming one unpaired electron spin per atom, saturation magnetization in a long cylinder of iron is(n for iron is 8.6 × 10²⁸  atoms/m³,Bohr magneton = 9.27 × 10⁻²⁴ J/T)

The strength of magnetic field around a bar magnet :

The hysterisis curve is studied generally for 

The B-H curve (i) and (ii) shown in the given figure is associated with

The narrowest hysterisis loop is for

In a cassette player, material used for coating magnetic tapes is :

Th direction of magnetic lines of force of a bar magnet is:

Curie temperature is the temperature above which

Susceptibility is positive and large for a

A ferromagnetic material is heated above its curie temperature. Which one of a correct statement?

Hysterisis is the phenomenon of lagging of