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What is a hard magnet?
Hard magnets are permanent magnets that do not require electricity to retain their magnetism and are not easily demagnetized. They are magnetically charged naturally and can be artificially, too.
Why aren't permanent magnets really permanent?
They can be demagnetized. Because nothing can be permanent :-)
What happens to a magnet when heated up?
It gets demagnetized at about 170 degrees Fahrenheit, or 70 90 degrees Celsius.
What distinguishes a permanent magnet from a temporary magnet?
Permanent magnets do not lose their magnetic ability. Temporary magnets, however, gain magnetic properties when they are touched or moved by a permanent magnet. The properties of a temporary magnet dissipates over time after the permanent magnet is removed.
Is a Refrigerator magnet a Permanent magnet?
yes
What is a hard magnet?
Hard magnets are permanent magnets that do not require electricity to retain their magnetism and are not easily demagnetized. They are magnetically charged naturally and can be artificially, too.
Why aren't permanent magnets really permanent?
They can be demagnetized. Because nothing can be permanent :-)
What will happen to the magnet if you put some electricity on it?
it will be demagnetized
What is the thing that weakens a magnet?
Magnets are "demagnetized" by extreme heat. If you boil a magnet in water, the heat will demagnetize the magnet.
Is a permanent a magnet?
A permanent magnet is a magnet which will keep its magnetism for a very long time and is difficult to change. No, As I think a permanent magnet means they have abilities to hold the magnetism when they are magnetized. Such as Alnico permanent magnets, but in fact, they can be demagnetized,such as high temperature, hit each other,pulse waves, out magnetic field influence...What's more, different permanent magnetic material, have different abilities on holding magnetism,they can be used in different environments. you can find some details from some manufacturers website, to learn some knowledges.
How can iron be demagnetized?
an iron can be demagnetised by ;-hammering it while facing east _west direction -hitting it hard on the ground -connecting it into an ac current while facing the east _west direction .
How can a magnet become demagnetized?
A magnet can become demagnetized by exposure to high temperatures, strong magnetic fields, or physical impacts that disrupt the alignment of its magnetic domains. These factors can cause the magnetic domains to lose alignment, weakening or eliminating the magnet's magnetic field.
Why are permanent magnets not used in cranes to lift heavy loads?
They can become demagnetized by impact, if they're picking up something which is also magnetic (which steel is), the magnet would need to be changed when the polarity was wrong, and then there's the matter of how you detach the magnet once you got the load into place.
Does heating up a magnet make it stronger?
Heating up a magnet actually makes it weaker. A magnet can be completely demagnetized when heated past it's Curie temperature.
Is the magnet in a compass a permanent magnet or electronic?
A. Compasses typically use a permanent magnet.
Is magnetite a magnet?
No, it's a permanent magnet. It consists of an iron oxide, and iron is a permanent magnet.
Is a needle in a compass a permanent magnet?
Yes, it is a permanent magnet.
