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The magnetic field goes from NORTH to SOUTH
Haihao Liu 8W
material, like steel or iron oxide. Magentic materials can also block magnetism.
Iron, nickel and cobalt, as well as materials containing a magnetic
Must stroke in one direction!
MAGNETISM
Non-contact force
Electromagnets are very useful in our lives. We use it in motors, hard disks, tape drives, speakers, and so on. They all operate on one principle: that by running an electric current through wires, you create a magnetic field. Electromagnets are basically “temporary” magnets that can be switched on and off. They behave in much the same way as permanent magnets such as the common bar magnet in that opposite poles attract and like poles repel. The main difference is that electromagnets have a “switch” to control its magnetism - the electric current. When the electric current is allowed to flow in a circuit, the moving electrons generate a magnetic field. This can be easily proven by putting a small compass near the circuit. Initially, the compass needle will be pointing towards Earth’s north magnetic pole when the circuit is open. When the circuit is closed and the electrons are flowing, the magnetic field generated will cause the compass needle to swing towards the circuit.
ELECTROMAGNETS
jammyjames added this comment 2009-06-16 08:33:19-05:00
Haha.... i found a spelling error! u wrote 'magentic material' not MAGNETIC material......owned. Anyway, JOBS DONE. add music, better, stronger and faster! yeah.
jammyjames added this comment 2009-06-16 08:33:19-05:00
Haha.... i found a spelling error! u wrote 'magentic material' not MAGNETIC material......owned. Anyway, JOBS DONE. add music, better, stronger and faster! yeah.