Question

Define electromagnet .What are the uses of electromagnet?

Answer 1

Hint: This question is related to the topic magnetic field and magnetism. Magnetic field is created around an electromagnet where one end of the electromagnet behaves as a magnetic north pole, while the other behaves as the magnetic South Pole. It is also called a Solenoid.

Complete step-by-step answer:
Electromagnet is a type of magnet in which a magnetic field is produced by passing an electric current. There are three main parts of electromagnet: iron rod, copper wire and electricity. Electromagnets are also used to make the strongest continuous magnetic field on earth .It is a type of magnet which is hollow cylinder in shape and wounded by copper wire and when electric current passes it produces magnetic field so it is also called a temporary magnet because it loses magnetism when current is stopped. A common electromagnet is a uniformly wound solenoid.
Hans Christian’s scientist discovered that electric current creates magnetic fields. The Earth is like one big bar magnet. The Earth magnetic field is 1000 times weaker than a typical bar magnet. Magnetic resonance imaging machines use magnets Electromagnet uses electricity to create their power of magnetism .They can be turned on and off when the electricity is turned on and off. Cranes use huge electromagnets to pick up scrap metals in junkyards .Powerful magnets are used in high speed trains, called maglev. These trains run very efficiently because these trains will float over its track and reduce friction. Many roller coasters use electromagnets to push the cars along the tracks.
Electromagnets are widely used in electrical and mechanical devices such as transformers, loudspeakers, motors and generators, MRI machines, magnetic locks, industrial lifting magnets, trains, induction heater which is used for cooking, hyperthermia therapy, musical instruments, electric bells and buzzers, magnetic separation materials such as separating metals from other scraps, scientific equipments such as mass spectrometers ,relay which is an electrically operated switch.

Note: The most powerful magnet in the universe is actually a star called a Magnestar. Magnets have been used to study bee communication patterns. Strong rare magnet can turn some metal into a magnet. Some farmers give their cow a magnet to swallow to prevent accidental eating of nails. Breakfast cereals often contain iron, some cereals contain enough iron that its pieces are attracted to a magnet.