GEOLOGY

Detailed explanation-1: -Answer: Solution: An electromagnet is a temporary magnet which behaves like a magnet when an electric current is passed through the insulated copper wire and loses its magnetism when current is stopped.

Detailed explanation-2: -An electropermanent magnet or EPM is a type of permanent magnet in which the external magnetic field can be switched on or off by a pulse of electric current in a wire winding around part of the magnet.

Detailed explanation-3: -An electromagnet is called a temporary magnet because it produces a magnetic field only when the current flows in its coil. The magnetic field vanishes when the current is switched off.

Detailed explanation-4: -The combined magnetic force of the magnetized wire coil and iron bar makes an electromagnet very strong. Electromagnets can be turned on or off and their strength can be changed by controlling the electric current.

Detailed explanation-5: -A bar magnet is an example of a permanent magnet since its magnetism cannot be switched on and off. A temporary (or induced) magnet can only be magnetised temporarily.