magnets
For levitation in ancient times men knew of a special kind of rock that could pull other rocks of the same kind and pieces of iron toward themselves. They were called lodestones. Today man uses the same force exerted by electromagnets and permanent magnets to provide magnetic aide to trains and more efficient power generators. Magnetism is defined as the force exerted by a magnetic field. A magnetic field is defined as the energy exerted by the magnet. It is caused by the alignment of the domains (sub-atomic particles) of an object. When the domains are lined up they produce magnetism. When the domains are not lined up then they cause the object to be demagnetized (having no magnetic power). Materials such as air, wood, copper, and water do not respond to the power of magnets. Electromagnets, like permanent magnets, have poles and magnetic fields. Actually, whenever an electrical current passes through a wire, it produces a magnetic field. Every electrical appliance or cord has a weak magnetic field around it. The difference between an electromagnet and a permanent magnet is that you can reverse direction of the current in an electromagnet. The greatest electromagnet that is known today is the Earth. The planet’s magnetism come
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Some common words found in the essay are:
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Approximate Word count = 1029
Approximate Pages = 4 (250 words per page double spaced)
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