Explain why an electromagnet is called a temporary magnet.

Hint In general, there are two types of the magnets which are available. One is the bar magnet which means that the material will have the magnetic power all the time, and the other magnet type is that the electromagnet, which means the material will get the magnetic power when the electric field is passed through the material.

Complete step by step solution
An electromagnet is a kind of magnet wherein the attractive field is created by an electric flow. Electromagnets normally consist of wire twisted into a curl. A current through the wire makes an attractive field which is gathered worse than broken, meaning the focal point of the loop. The attractive field vanishes when the current is killed. The wire turns are frequently twisted around an attractive centre produced using a ferromagnetic or ferrimagnetic material, for example, iron; the attractive centre focuses the attractive motion and makes an all the more remarkable magnet.
The main advantage of an electromagnet over a perpetual magnet is that the attractive field can be immediately changed by controlling the measure of electric flow in the winding. Notwithstanding, dissimilar to a lasting magnet that needs no force, an electromagnet requires a constant graceful current to keep up the attractive field. An electric flow streaming in a wire makes an attractive field around the wire, because of Ampere's law (see drawing beneath).
To focus the attractive field, in an electromagnet the wire is twisted into a curl with numerous turns of wire lying one next to the other. The attractive field of the apparent multitude of turns of wire goes through the focal point of the loop, making a solid attractive field there. A loop framing the state of a straight cylinder (a helix) is known as a solenoid. So, the electromagnet is commonly called as the temporary magnet.

Note When the material will have the electric field then only the material will experience the magnetic field. If the electric field to the material is cut off, then the material will act as the normal metal. If the electric field is supplied then the material acts as a magnet and is called an electromagnet.