electromagnetism and magnetism
Magnetic materials can be magnetized or attracted by magnets.
These metals are magnetic: the cobalt iron is mainly iron, so the steel is also magnetic.
Bar magnets are permanent magnets.
This means that its magnetic properties are there all the time and cannot be turned on or off.
Magnetic rods have poles: Arctic (or north-seeking pole)south pole (or south-seeking pole)
The Arctic is usually shown as N, and the Antarctic is shown as SAttract and repelIf, and you put two bar magnets together, and two things happen, attraction and rejection: if you put an Arctic and an Antarctic together, if you put two Arctic together, they attract magnets to stick together, or two Antarctic together, they reject each other, the pushes away from each other. We say that the opposite poles attract each other, just as the poles are mutually exclusive.
Can you test if a piece of metal is really a ?
It\'s not a good test to see if it\'s stuck to a , because unmagnetized iron, steel, cobalt, and nickel objects do the same.
Therefore, you can only prove that an object is a if it repels a known .
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