Electromagnet is a temporary magnet whose strength can be increased by increasing the current.Write three uses of it.
Answers
Answer:
An electromagnet is a type of magnet in which the magnetic field is produced by an electric current. Electromagnets usually consist of wire wound into a coil. A current through the wire creates a magnetic field which is concentrated in the hole, denoting the centre of the coil. The magnetic field disappears when the current is turned off. The wire turns are often wound around a magnetic core made from a ferromagnetic or ferrimagnetic material such as iron; the magnetic core concentrates the magnetic flux and makes a more powerful magnet.
The main advantage of an electromagnet over a permanent magnet is that the magnetic field can be quickly changed by controlling the amount of electric current in the winding. However, unlike a permanent magnet that needs no power, an electromagnet requires a continuous supply of current to maintain the magnetic field.
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. Electromagnets are also employed in industry for picking up and moving heavy iron objects such as scrap iron and steel.
A portative electromagnet is one designed to just hold material in place; an example is a lifting magnet. A tractive electromagnet applies a force and moves something.[8]
Electromagnets are very widely used in electric and electromechanical devices, including:
Motors and generators
Transformers
Pickups
Relays
Electric bells and buzzers
Loudspeakers and headphones
Actuators such as valves
Magnetic recording and data storage equipment: tape recorders, VCRs, hard disks
MRI machines
Scientific equipment such as mass spectrometers
Particle accelerators
Magnetic locks
Magnetic separation equipment, used for separating magnetic from nonmagnetic material, for example separating ferrous metal from other material in scrap.
Industrial lifting magnets
magnetic levitation, used in a maglev train or trains
Induction heating for cooking, manufacturing, and hyperthermia therapy
Answer:
the process by which green plants turn carbon dioxide and water into food using energy from sunlight
सूर्य के प्रकाश से हरे पौधों द्वारा कार्बन डाइ-ऑक्साइड और जल को भोजन का रूप देने की प्रक्रिया; प्रकाश-संश्लेषण; फ़ोटोसिंथीसिस