Can Electromagnets be turned on and off true or false?

Answer 1

An Electromagnet.

Take a screwdriver, and a put 50 turns of wire round the screwdriver. Now connect one wire to positive and one wire to negative of a battery and try to pick up some paperclips.

Answer 2

It can be, but not necessarily. It depends on the number of windings and the amount of electricity applied. An electromagnet is a form wound with wire that becomes magnetic when power is applied. Often, most or all the magnetism is lost once the power is removed, depending on the material used for the core.

Depending on the material used, the core of an electromagnet can sometimes become permanently magnetized. That is one way to create a magnetic screwdriver. You'd wrap the screwdriver shaft with wire and briefly apply direct current to both ends of the wire. After that, there should be some residual magnetism, and just enough to help hold a screw in place.

Answer 3

True. An electromagnet is only magnetic while an electric current is passing through the coil of wire. Very large electromagnets on a crane is a familiar sight in a scrapyard. It is used to pick up scrap metal from the ground and drop into a wagon for transporting to an iron foundry for recycling.

Answer 4

True. Electromagnets can be turned on and off by controlling the flow of electric current through the coils of wire, which determines the strength of the magnetic field produced. This property makes electromagnets useful in a variety of applications where magnetism needs to be controlled.

Answer 5

Yes.
Electromagnets turn on when an electrical current is sent through the wiring wrapped round the iron core. It ceases to be magnetised when the current is turned off.

Answer 6

Yes, the electricity can be turned on and off and so the magnet is on or off

Answer 7

Yes, simply disconnect the power source.