Magnetic keepers help to retain magnetism.

In a magnet,

Magnets that retain magnetism for a very long period of time

A magnet is suspended in the magnetic meridian with an untwisted wire. The upper end of wire is rotated through 181° to deflect magnet by 37° from magnetic meridian. Now this magnet is replaced by another magnet and upper end of wire has to be rotated by 273° to deflect magnet by 53° from magnetic meridian. The ratio of magnetic moment of the two magnets respectively is

The relative magnetic permeability of a magnetic material is 800. Identify the nature of magnetic material and state its two properties.

The net magnetic moment of the two identical magnets each of magnetic moment M_0 inclined at 60^@ with each other is

How many neutral points will be obtained when a bar magnet is kept with magnetic moment parallel to earth's magnetic field ?

A paramagnetic material is kept in a magnetic field. The field is increased till the magnetization becomes constant. If the temperature is now decreased, the magnetization.

The magnetic properties of an induced magnetic material .................. (disappear/get stronger) as soon as the magnet is removed.

All these magnetic materials loss their magnetic properties when

Assertion (A): The earth's magnetic field is due to iron present in its core. Reason (R ): At a high tempeature magnet losses its magnetic property or magnetism.