U.u!..como es esto?

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  • Publicado : 12 de noviembre de 2011
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To find north we use a compass. the compass needle points to magnetic north because it is a magnet. The tip of the needle which points north is called the north-seeking pole or N pole, and the otherend is called the south-seeking pole or S pole.
If we suspend two magnets side, we observe that the N pole of one magnet is attracted to the S pole of the other. This is because unlike poles attractand like poles repel. The force of attraction or repulsion between poles is in proportion to the strength of the poles and inverse proportion to the square of the distance between them.
Shows how thelines of force between unlike and like poles can be seen using a card and some iron fillings. While the iron fillings are near the magnet, in the magnetic field, they become magnetized by induction.Induced magnetism means that a substance becomes temporality magnetic because of the influence of another magnet.
Magnest are normally made using steel bars and a solenoid, a long electri coil. Abar may lose its magnetism, or be demagnetized by rough treatment, or by being heated.
All magnetic substances lose their magnetism at temperatures known as the curie-point.

Magnet: and objectwhich has the properity of attracting iron and certain other material.
The properity itself is called magnetism.
North pole/south pole: the tow ends of a magnet, where the force of magnetism isstrongest. Like poles repel each other adn unlike poles attract each other.
Magnetic field: the entire area in which a magnet exerts its force.
Lines or force: lines showing the direction and strength ofthe forces exerted within a magnetic field.
Electromagnetism: the magnetic force exerted by an electric current.
Coil: an electric wire twisted into a spiral shape.
Armature: a magnetized metal barused in electric motors.
Commutator: a divice used in electric motors to reverse the flow of current.
Stator: the stationary part of an electric motor generator.
Rotor: the rotating part of an...
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