What happens when an external magnetic field is removed?

In soft iron, the domains do shift back into their random positions when the external field is removed. To make permanent magnets a piece of hard iron is placed into a magnetic field. The domains align with the field, and they retain most of that alignment when the field is removed.

What happens to the magnetism of ferromagnetic substance when we remove the magnetic field?

The domains will remain aligned when the external field is removed, creating a magnetic field of their own extending into the space around the material, thus creating a “permanent” magnet.

When external magnetic field is removed a ferromagnetic material retains?

In the absence of an external magnetic field, the magnetic moments of domains are randomly arranged, hence the net magnetic moment of a ferromagnetic substance is zero. On removal of the external magnetic field, ferromagnetic substances do not lose their magnetism. i.e. they are permanent magnets.

Which of the following will retain their magnetization when removed from an external magnetic field?

Iron, for example, can retain appreciable residual magnetization even after the external magnetic field has been removed. This magnetic memory is one reason iron and iron alloys are frequently chosen for making permanent magnets.

When a ferromagnetic material is removed from an external magnetic field the net magnetic field of its magnetic domains?

When a ferromagnetic material is in the unmagnetized state, the domains are nearly randomly organized and the net magnetic field for the part as a whole is zero. When a magnetizing force is applied, the domains become aligned to produce a strong magnetic field within the part.

When a ferromagnetic material is placed in an external magnetic field the magnetic domains?

The magnetic domains. have no relation with the field.

Why can ferromagnetic materials retain their magnetism?

A ferromagnetic substance contains permanent atomic magnetic dipoles that are spontaneously oriented… They become oriented in the same direction, so that their magnetic fields reinforce each other. One requirement of a ferromagnetic material is that its atoms or ions have permanent magnetic moments.

How do ferromagnetic materials retain magnetism?

Ferromagnetic materials have some unpaired electrons so their atoms have a net magnetic moment. They get their strong magnetic properties due to the presence of magnetic domains. In these domains, large numbers of atom’s moments (1012 to 1015) are aligned parallel so that the magnetic force within the domain is strong.

When the external magnetic field applied to a magnetic material is removed the magnetic material will not lose its magnetic property immediately?

The effect of applying a magnetising force to the material is to align some of the domains to produce a non-zero magnetisation value. Once the magnetising force has been removed, the magnetism within the material will either remain or decay away quiet quickly depending on the magnetic material being used.

How do ferromagnetic materials become magnetised?

Generally, the magnetic domains point in different directions, so the material is still not magnetic. However, the material can be magnetized (made into a magnet) by placing it in a magnetic field. When this happens, all the magnetic domains line up, and the material becomes a magnet.

When a ferromagnetic material goes through a hysteresis loop the magnetic susceptibility?

Therefore, when a ferromagnetic material goes through hysteresis loop the magnetic susceptibility may be zero, may be negative and may be infinity.

How domains align themselves when placing a ferromagnetic material in a strong magnetic field?

Within domains, the poles of individual atoms are aligned. Each atom acts like a tiny bar magnet. Domains are small and randomly oriented in an unmagnetized ferromagnetic object. In response to an external magnetic field, the domains may grow to millimeter size, aligning themselves as shown in Figure 2(b).