Question

What is electromagnetic? What are the advantages and disadvantages of it. What are the uses? How to construct it? ​

Answer 1

Answer:

A simple electromagnet consisting of a coil of wire wrapped around an iron core. A core of ferromagnetic material like iron serves to increase the magnetic field created.[1] The strength of magnetic field generated is proportional to the amount of current through the winding.[1]

Magnetic field produced by a solenoid (coil of wire). This drawing shows a cross section through the centre of the coil. The crosses are wires in which current is moving into the page; the dots are wires in which current is moving up out of the page.

Explanation:

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.[2]

Answer 2

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The process of producing induced current in a closed circuit or in a coil by changing the magnetic field linked with the coil is known as electromagnetic induction. This process of producing induction current is known as electromagnetic induction.

The advantages of Electromagnetic Induction are:

• AC or DC electrical power can be generated using Electromagnetic energy source
• Eliminates the need of an external electrical source to generate electrical power .

Disadvantages of Electromagnetism

• It takes a lot of energy to use.
• If cranked up to high it could be dangerous.
• Electromagnets heat up very fast.

Use :

Other uses for electromagnetic induction include electric motors used in anything from washing machines to trains, electric hobs and cookers, transformers, welding and guitar pickups. Gill R&D, for example, use electromagnetic induction for non-contact position sensors.

Construction :

Electromagnetic or magnetic induction is the production of an electromotive force (i.e., voltage) across an electrical conductor in a changing magnetic field. Michael Faraday is generally credited with the discovery of induction in 1831, and James Clerk Maxwell mathematically described it as Faraday's law of induction.