They turn on and off by taking the battery out and putting it back in or if it has a switch then you could use that.
An electromagnet requires electric power to be a magnet. You turn it off the same way you turn off a light, by turning the switch.
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.
When you need a magnet you can turn on and off an electromagnet is used.
Being able to turn electromagnetic on and off is what separates it from a normal magnet.
turn it off by unplugging the current source.
The advantage of an elecromagnet is that you can turn it on and off with a simple switch. So for example if you want to pick up a scrap car with a crane/electromagnet and move it, you can turn the electromagnet off when you want to release the car. You could not do the with a permanent magnet obviously.
no because you need electricity to turn it on
An electromagnet can be turned on and off, with an electric current and a magnet can not turn off
It stops behaving like a magnet. It loses all its power.
Because with an electromagnet, you can turn it off and on - you can pick things up with it then drop them again.
Electromagnets are energized with an electric current. Turn the power off to stop the current will do the trick.
by decreasing its current,by decreasing turns of coil