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If we heat a magnetic material above its "Curie Temperature," its magnetism vanishes entirely. When the magnet cools down again, all the microscopic magnetic domains will point in circles, so the magnet will have zero overall field. Neodymium magnets have a low Curie Temp., so they are more sensitive to overheating than other types of magnet.
If we expose a magnet to the field from a strong electromagnet, the electromagnet will magnetize the magnet perhaps in a different polarity. But if we instead use an AC electromagnet, then move it away from the magnet, the magnet's polarity will flip back and forth, becoming weaker and weaker. The magnet will end up demagnetized. This is called "Degaussing."
Steel magnets are sensitive to mechanical shocks, and you can weaken a steel magnet by striking it with a hammer. Other magnetic materials are far less sensitive to hammering.
We can also demagnetize a magnet by forcing its poles together. For example, if we bend a horseshoe magnet so it forms a complete circle, its field will become a circle entirely inside the magnet, and it will have no poles or attraction. Or, if we grind a magnet up into small pieces, the pieces will align so the north pole of one fragment will be against the south pole of another, and the outside field will be small or zero.
What else can I help you with?
Can a magnet be broken?
Not exactly. All pieces of the magnet retain their ferrous properties, but if they were (for example) dropped, then the shock of the fall could potentially make them lose a bit of magnetism. Extreme temperature changes and high power electric discharges could also decrease the power of the magnet.
What make magnet lose its magnetism if it is?
Magnets can lose their magnetic properties if exposed to high heat or are made subject to high impact. The temperature at which magnets lose magnetic properties is referred to as the Curie Temperature for ferromagnetic materials.
Will a magnet still be a magnet if it is melted?
A magnet is produced by aligning the magnetic domains in a material to point in the same direction. When heated, the magnet loses its magnetism as the molecular motion, which is caused by heating, destroys the alignment of the magnetic domains. Ferromagnetic materials also lose its magnetism after being melted. However, when the magnet is being hammered whilst cooling in a magnetic field, the melted magnet would gain its magnetism again.
Does heating up a magnet make it stronger?
Heating up a magnet can temporarily increase its magnetic strength by aligning its magnetic domains. However, once the magnet cools down, it will return to its original magnetic strength. Heating a magnet beyond its Curie temperature can cause it to lose its magnetism altogether.
Can you make a magnet from ordinary iron?
Yes, you can turn ordinary iron into a magnet by placing it in a strong magnetic field or by stroking it repeatedly with a magnet. This process aligns the magnetic domains in the iron, making it magnetic.
Why should you never drop a magnet on the floor?
It will lose its magnetic field. The vibrations made from the drop charge the electrons and make them move out of the line that they were in, this causes the magnet to lose its magnetism.
How can you make a magnet stick to aluminum?
You cannot make a magnet stick directly to aluminum because aluminum is not magnetic. However, you can make a magnet stick to aluminum by placing a magnetic material, such as iron, in between the magnet and the aluminum surface.
How do you make a powerful magnet?
To make a powerful magnet, use a strong magnetic material like neodymium. Shape it into a magnet by applying a magnetic field while it cools down. Finally, the magnet can be magnetized by rubbing it against a magnet or by exposing it to an electrical current.
How do you make a metal magnet?
To make a metal magnet, you can create a temporary magnet by stroking a metal material (like iron) with a permanent magnet in the same direction. This aligns the magnetic domains in the metal. For a more permanent magnet, you can heat the metal to a specific temperature and then cool it in the presence of a magnetic field to enhance its magnetic properties.
How do you make a magnetic motor?
Magnet->Electricity->Motor
How do you make magnetic toys?
Put a magnet on a toy...?
How do you magnetize a magnet?
To magnetize a magnet, you can rub it against another magnet in the same direction multiple times. Alternatively, you can expose the magnet to a strong magnetic field in the same direction. This will align the magnetic domains within the material and make it magnetic.
