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Electromagnet.
it is a piece of metal (usually iron) that is wrapped in copper wire.
it is turned on by putting electricity through the copper wire. it then producces a magnetic field when electricity is run through it.
Wiki User
∙ 11y ago
Wiki User
∙ 14y agoNo, a bar magnet cannot really be "turned off" in the manner of a light switch. The magnetic domains are set up when the magnet is manufactured, and there they pretty much stay. But there is a thing called the Curie point we need to review.
If a permanent magnet is heated beyond the Curie point for the material of which it is made, the magnetic domains, which were sort of "locked in place" when the magnetic was made, get "scrambled" because the material is so hot. The heating of the material of the magnet allows the atoms it is made of to move around considerably, and these atoms will abandon the structure that has uniformly arranged their magnetic domains. The magnet loses its magnetic ability, and when it cools below the Curie point, the field will not reestablish itself. In this case, the magnet is "turned off" in a permanent way.
A bar magnet can have its field reduced by wrapping a coil of wire around it and applying a current through the coil. With enough current through the coil the magnetic strength at the ends of the magnet can be reduced or increased temporarily as long as the current is applied. If the coil is energized with high enough current the magnet may be heated above its Curie point and the magnet will loose its initial strength.
Wiki User
∙ 7y agoNot in the same way an electromagnet can be turned on and off. As the name suggests the magnetism is permanent. However there are ways a permanent magnet can be de-magnetised but it is not a simple on/off procedure.
Wiki User
∙ 15y agoAn electro magnet can, but not the other kind.
Wiki User
∙ 14y agoThat is called an electromagnet. When the current flows, there is magnetism, when the current is switched off, the magnet stops working as a magnet.
Wiki User
∙ 14y agoYes, if you open the electrical circuit of an electromagnet there will no longer be any magnetism.
Wiki User
∙ 7y agoTrue
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Why electromagnet is different from a permanent magnet because an electromagnet what?
Mainly in that the electromagnet is NOT permanent. In other words, it can be switched on and off.Another relevant difference is that the electromagnet constantly requires power, at least while it is on.
Can Permanent magnets be turned on and off?
Electromagnet which uses electric current can be turned on and off.
Why are electromagnets used instead of a permanent one?
sometimes in magnetic sepration etc electromagnets are more useful than permanent one as first magnet is used to seprate metallic waste and then its turned off so that attracted waste falls off at desired place so here permanent magnets are not that use full as electromagnet as in permanent magnet waste would get attracted but it would not fall. so electromagnet is more useful than permanent one.
Is a needle in a compass a permanent magnet?
Yes, it is a permanent magnet.
How do you turn off an electromagnet?
This is what makes a magnet an electromagnet - the ability to turn it on and off... Anyway, electromagnets can be turned off with either the help of a switch, or just by disconnecting the power supply.
Is the magnet in a compass a permanent magnet or a electromagnet?
It is a permanent magnet. Electromagnets(as the name suggests) requires an electric source to become a magnet, when the power source is turned off it will not function as a magnet.
What is a magnet that can be turned on and off called?
Electromagnets have an electric current running through them that enables there conductive power to be strengthened. However, a magnets full conductive power can never be "turned off/on".
What magnet can be switched on and off?
An electro-magnet can be turned on and off.
How is a solenoid similar to a magnet?
A solenoid acts like a magnet when an electrical current is sent through the coil. A permanent magnet is magnetic all the time. Therefore, they are similar when both act like a magnet, but not when the solenoid is turned off.
What is a magnet that can be turned off?
An electromagnet.
Why electromagnet is different from a permanent magnet because an electromagnet what?
Mainly in that the electromagnet is NOT permanent. In other words, it can be switched on and off.Another relevant difference is that the electromagnet constantly requires power, at least while it is on.
What is the difference between permanent magnets and temporary magnets?
One is temporary, the other is more or less permanent.
How does an electromagnetic differ from a permanent magnet?
An electromagnet is only magnetic while electricity is being passed through it. When the electricity is turned off, it no longer works.
Is not a permanent magnet?
An electromagnet is a magnet while an electric current is running through the coil. Turn off the current and it is no longer magnetised, and is, therefore, not a permanent magnet.
What is a strong magnet that can be turned on and off.?
an electromagnet
Is a strong magnet that can be turned on and off?
an electromagnet
What are three types of metal that can be turned into a permanent magnet?
There are two main/most common, types of magnet. One is permanent and the other is temporary. There could be more detailed classifications, but I do not know them ;)
