There is an electromagnet in that crane
An electromagnet is temporary because the field disappears when the current is switched off.
A choke, an electromagnet, an electric motor stator, an electric motor rotor, etc. all depending on details of construction and use that are unstated in the question.
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.
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".
Sound Wave
There is an electromagnet in that crane
Electromagnets are widely used now. Instead of traditional magnets.
An electromagnet is temporary because the field disappears when the current is switched off.
An example of an electromagnet can be a car, generator, and the "yoke" of a tv has 2 electromagnets. Any device that is made to be magnetic by passing an electric current though the device.
only ferrous metals for example, iron.
It very efficiently separates ferrous from non-ferrous scrap.
A choke, an electromagnet, an electric motor stator, an electric motor rotor, etc. all depending on details of construction and use that are unstated in the question.
Green is a non example of altitude.
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.
What is a non example of a decomposer?
what is a non example for locate