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# What is Electromagnetism? | Electricity and Magnetism

August 7, 2022 written by Adeel Abbas

Electromagnetism is the branch of physics that is concerned with the observation and laws relating to electricity and magnetism.

## Electromagnetism

As per the definition, electromagnetism is the study of the flow of electrical currents. Electromagnetic waves are the kind of radiation that is generated by these currents.

The electromagnetic field is the property that causes an electric charge to attract other charges. It can be compared to the force that pulls objects together. This force is generated by the magnetic field, but the magnetic field does not always exist.

Cathode ray oscilloscope used electromagnetism for plotting graphs at a very high speed. The working principle of a galvanometer depends on the fact that when a conductor is placed in a magnetic field, it experiences a force torque that rotates it indicating the flow of current.

There are many other instruments that are made after some changing in galvanometers for example ammeter, ohmmeter, and avometer.

We all know that Magnetism and electricity are two different things, but some people confuse magnetism with electromagnetism.

### What is a magnet?

An object having the property of attracting small pieces of iron is called a magnet.

#### Properties of magnet

• When a magnet is suspended so that it can move freely, it gains itself along the north-south direction.
• A single pole of the magnet cannot be obtained.
• An iron piece can be magnetized by rubbing it against a magnet.
• Similar poles of a magnet repel each other while opposite poles attract each other.

### Magnetic field

The space or region around a magnet where the effect of its magnetism, such as the deflection of a compass needle, can be detected is called a magnetic field.

### Magnetic field lines

The path of an isolated north magnetic pole in a magnetic field represented magnetic lines of force. The direction of lines of force can be determined by the right-hand rule.

### Magnetic flux

The total number of magnetic field lines of forces passing through any surface placed perpendicular to a magnetic field is called magnetic flux.

Ampere law is used to determine flux density. The difference between electric flux and magnetic flux is the field of force.  The total number of electric field lines passing through the surface is placed in an electric field.

### Magnetism

The force that is present in all metals and ferromagnetic materials is known as magnetism. It is the magnetic property of solids. Magnetism is a property of a material that attracts magnetic objects.

Electromagnetism is the name of an electric force that is used to transfer energy through a wire. The movement of the electrons inside a metal is known as the source of magnetism.

Magnetism is the property of a material and electricity is the power source of that. Both are different from each other, but you must remember that magnetism is the property of all metals.

The electromagnetic field is the kind of energy that can travel through space, but it can also be created by the motion of electricity through a wire. Every particle in the universe has a small electric charge. A positive charge can be the electron. The negative charge is the proton.

The particles that have positive charges are called electrons. The particles that have negative charges are called protons. These particles are so tiny that they are smaller than an atom. These particles also move around very fast.

Electrons are attracted to the nucleus of the atom, but the nuclei also attract protons. This is why the atoms are held together by the nucleus.

## How did the electromagnetic fields work?

If you were to take two magnets and touch them together, then the magnetic field between the two magnets would be equal to the attraction between the two magnets. This means that the magnetic fields and the attraction between the two magnets cancel each other out.

This is how electromagnetic fields work.

## Electricity and magnetism

Electricity and magnetism can be combined into a single concept. The two concepts of electricity and magnetism are known as electromagnetism.

The electromagnetic force that holds atoms together is the electromagnetic force. It is the same force that makes the planet orbits the sun.

You can use the force of electricity to lift things. If you hold a magnet and a piece of iron up in the air, then you will feel the force of the magnetic field holding the two objects together.

Electromagnetism is the power behind the atom.

The magnetic force that holds an atom together is known as the electromagnetic force. The nucleus of the atom has a strong positive charge. It attracts electrons.

Electrons have a negative charge. They are attracted to the nucleus. The forces between the positive and the negative are equal in strength.

The magnetic field produces due to the current carrying solenoid. With the help of the magnetic field, we can determine the charge-to-mass ratio of electrons.

If you take a pair of magnets, the north pole of one will repel the south pole of another. This is the opposite force that holds the magnets together.

The attractive force between the two magnets is equal to the repelling force.

## Properties of magnetism

• The electromagnetic force is the force that keeps atoms together. It also makes light work and is used to power radios and cell phones.
• This is the power that turns the wheels of a car.
• Electromagnetic force is also used to control our computers. It is also used to stop a bullet.
• The electromagnetic force can be used to send signals through wires. This is the way the internet works.
• If you have a magnet and you hold it close to a coil of wire, then you can generate a current in the wire. Alternating current generators use this phenomenon.
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