Magnetics or magnetism is a basic principle in which some types of substances are attracted or repelled by the presence of some other substance in its vicinity. The most common substances among these are iron and steel. Due to the properties exhibited by these materials they are very useful in the field of industrial engineering among others.
The term magnetics also refers to a field of engineering study that involves magnetic materials.

Magnetism is a field of study that examines phenomena that are related to magnetic fields. It also studies the effects that a magnetic field has on other materials. Fields that surround both permanent and electromagnets seem to have the same effects on nearby objects. Magnetism belongs to one of the four fundamental forces of nature, which also includes gravity, the weak atomic force, and the strong atomic force.

Permanent magnets start to show magnetic fields of their own when they are placed into a strong magnetic field. They also continue to possess the magnetic field after they have been taken out of original field. Permanent magnets are classified by to their ability to maintain their own magnetic fields in different types of environments that involve changes in things such as the temperature, etc.

Magnetism is displayed naturally by some elements or it can also be imbued artificially. For example, some natural magnetic materials include cobalt, iron ore and nickel. Electromagnets are used heavily in industrial applications wherein electric current is passed through some substances to generate a strong magnetic field. Another category of magnets are the composite magnets which are an alloy of two or more substances e.g. alnico or ceramic magnets. Most substances display magnetic properties because of the presence of electricity. In other words, electrically charged atoms inside an element lead to the generation of a magnetic field.

Magnetics can be defined to include only passive components which use internal magnetic fields to alter the phase of electric current. Transformers and inductors are examples of these currents. These magnetic devices are designed to change voltage levels and isolate system sections with various ground levels. Inductors can be used to control AC current and voltage and to filter out any unwelcome electronic signals.

Though most people don’t know it, magnetic devices are usually used as components of most electromechanical machines. These devices are often hidden away in subassemblies, and don’t give out any observable noise or other types of signals. Magnetic devices are found in many different items such as: telephones, automobile accessories, shop tools, sound systems, watches, motors and home appliances.

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