GEOLOGY

Detailed explanation-1: -Electromagnets are useful because you can turn the magnet on and off by completing or interrupting the circuit, respectively.

Detailed explanation-2: -Electromagnets can be turned on or off and their strength can be changed by controlling the electric current. An electromagnet is a solenoid wrapped around a bar of iron or other ferromagnetic material. It is stronger if there are more turns in the coil of wire or there is more current flowing through it.

Detailed explanation-3: -Electromagnets are used in several electrical devices such as electric bell, electric motor, loudspeakers etc. They are also used by doctors to remove particles of iron or steel from a patient’s eye and to remove pieces of iron from wounds. Was this answer helpful?

Detailed explanation-4: -Electromagnets are widely used as components of other electrical devices, such as motors, generators, electromechanical solenoids, relays, loudspeakers, hard disks, MRI machines, scientific instruments, and magnetic separation equipment.

Detailed explanation-5: -An electromagnet loses its magnetism when the current flowing through its coil is stopped.