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How to explain magnetism? | Physics

How to explain magnetism? Most common example of a natural magnetism and permanent magnets that attract objects made of iron

The most common example of a natural magnetism and permanent magnets that attract objects made of iron. This is only a manifestation, visible to the naked eye, much more complex phenomena that are mediated by the structure of atoms of a substance and which are closely related to electrical phenomena. Magnetism is one of the phenomenon of why some materials are attractive or repulsive act by force on other materials.
Electricity and magnetism are closely related because they all essentially arises from the motion of electrons orbiting the nucleus around its own axis. This motion is called spin. motion of electrons corresponds to small loops of electric currents that create an electric field.
each electric field, no matter how small it may, in relation to a magnetic field, whose influence is felt at a certain distance.
Magnetic properties of materials depend on a complex schedule lines What more have threading the coil, the magnetic field is stronger. On this basis the principle that massive electromagnets are used to lift large iron objects. The country - perhaps due to the composition of its nucleus - acts as a magnet around which creates a magnetic field along the direction that goes around the Earths North Pole to the South Pole. Therefore, the magnetic compass needle adjusts the direction of north - south. Compass known to the ancient Chinese, but first talked about the Earth as a magnet English physicist William Gilbert 1600th year. Magnetism is derived from electricity and can be achieved, and vice versa, if we running a scroll between the two poles of a magnet, it flows along the electric current - induced currents -. The same happens when the coil is stationary and the magnet rotates. The possibility of obtaining an induced electric current is based on the work of electric generators, such as the dynamo and alternator, and electric motors in general. The ordinary bicycle dynamo works on this principle.

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