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What can the magnet be divided into?
The permanent magnet produces a magnetic field to attract the magnetic material, such as iron, nickel, cobalt and other metals. The midpoint of the bar magnet is hung with thread. When stationary, its two ends of each point to the Earth's North and South. The end pointing to the north refers to the North Pole or the N pole, and the end pointing to the south refers to the South pole or S pole.
If the Earth is thought as a large magnet, the Earth's magnetic North Pole is guide pole, and geomagnetic South Pole is the North Pole. Between magnets, the same polar phase will exclude with each other, and the different polar phases will attract with each other. The guide pole and the North Pole will attract with each other.
The magnet can be divided into "permanent magnet" and "non-permanent magnet. The permanent magnet can be natural products, also known as lodestone, and can also be made by hand. Non-permanent magnets, such as electromagnets appear magnetic only under certain conditions.
from：http://www.htmagnets.com/newsd-nid-4.html
