Let's share and introduce them!
1. Magnetic Properties: Magnets have magnetism and can attract objects made of iron.
2. Magnetic Poles: Each magnet has two poles, the North (N) pole and the South (S) pole, and they exist in pairs.
3.Temporary Magnets and Permanent Magnets: When a ferromagnetic material is magnetized and easily loses its magnetic properties, it is called a temporary magnet (such as iron); when a ferromagnetic material is magnetized and does not easily lose its magnetic properties, it is called a permanent magnet (such as steel).
4. Magnetic Pole Interaction: When two magnets are close to each other, the same poles repel each other, while different poles attract and stick together. Like poles repel, and unlike poles attract.
Most magnetic materials can be magnetized to saturation in the same direction, which is called the magnetization direction (orientation). The magnetism of a magnet without a direction (also known as an isotropic magnet) is much smaller than that of a magnet with a direction (also known as an anisotropic magnet).
What is the standard "North - South" industrial definition?
The "North Pole" is defined such that when a magnet is randomly rotated, its North Pole points to the Earth's North Pole. Similarly, the South Pole of a magnet points to the Earth's South Pole.
How can you identify the North Pole of a magnet without labels?
Obviously, you can't tell just by looking. You can use a compass close to the magnet. The pointer that points to the Earth's North Pole will point to the South Pole of the magnet.
How to handle and store magnets safely?
Be very careful, because magnets can stick together on their own and may pinch your fingers. Magnets can also be damaged due to collisions with each other (collisions at the edges or causing cracks).
Magnets should be kept away from objects that are easily magnetized, such as floppy disks, credit cards, computer monitors, watches, mobile phones, medical devices, etc.
Magnets should be kept away from pacemakers.
For larger magnets, plastic or cardboard spacers should be placed between each magnet to ensure that the magnets can be easily separated.
Magnets should be stored in a dry and constant - temperature environment as much as possible.
How to achieve magnetic isolation?
Only materials that can adhere to magnets can block the magnetic field, and the thicker the material, the better.
What is the strongest magnet?
Currently, the highest - performance magnets are rare - earth magnets, and among rare - earth magnets, NdFeB is the strongest. But when the temperature exceeds 200 degrees Celsius, SmCo (cobalt - samarium) is the strongest magnet.
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