Question

What is electromagnet? Which material is used in the core of electromagnet? What are the factors on which strength of electromagnet depends?

Answer 1

electromagnet means the substance which contains both electric and magnetic field

Answer 2

An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. The magnetic field disappears when the current is turned off. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole in the center of the coil. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagneticmaterial such as iron; the magnetic core concentrates the magnetic fluxand makes a more powerful magnet