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Electromagnets are basically coils with a metal core in them. If current flows through the coil they are magnetic, if there's no current flowing through it, it's not.

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Whyb are natural magnets noy used in cranes to lift heavy loads?

Natural magnets are not strong enough to lift heavy loads typically encountered in crane operations. Man-made magnets, such as electromagnets, can be controlled and adjusted to generate the necessary magnetic force to lift heavy objects more efficiently. Additionally, natural magnets can lose their magnetism over time, making them unreliable for industrial applications.


Is there a difference between magnets and electromagnets?

"electro magnets" are magnetic ONLY when electricity travels through a coil of wire surrounding them. "Magnets", as you state it, are permanent magnets and remain so independent of and not dependent upon any additional electrical charge.


How are temporary and permanent magnets alike?

Yes Permanent magnets is the term used to describe magnets that are always magnetic, an non permanent magnet would be an electro magnet which is only a magnet when an electric current is put through it.


Do doorbells have electro magnets in them?

Yes, most doorbells have an electromagnet inside them. When the doorbell button is pressed, the circuit is completed, activating the electromagnet which causes a hammer to strike the bell or chime, producing the ringing sound.


What does a magnet do in a microwave?

A magnet in a microwave can potentially cause sparks, arcing, or damage to the microwave itself. This is because the microwaves emitted by the oven can cause the magnet to become hot and possibly catch fire. It is not recommended to put magnets inside a microwave.