October 3, 2022

What is the significance of magnetic field?

magnetic field

What science concepts do you feel are at the core? Motion, force, energy? Definitely, Yes! There are many science concepts that are the basis or foundation of more significant concepts. For example, to understand the magnetic force definition, you should know what forces mean.

One such significant topic is the magnetic field. It is one of the vital concepts as it is also a part of the 10th NCERT syllabus. Moreover, in further physics studies, it can be crucial to understand the know-how of this chapter.

Hence, it is essential to have a strong foundation of the basic concepts so that it will be easy for you to scale up further. Therefore, in this post, you will read the basics of the magnetic field. Additionally, we will discuss the components of the magnetic field.

What does a magnetic field mean?

Have you ever used a magnet? Or have you observed it?

Suppose you put a magnet on a table. Also, you have one metal pin that you did keep beside that magnet. What does happen? A pin gets attracted to the magnet.

Now let us understand this experiment in a scientific way. When you keep a metal pin in the area of that piece of magnet, the force will let that pin come towards the magnet. But, in a contrary way, an object can get away from that magnet in the same field. However, the field that helps such pushing and pulling of objects is known as the magnetic field.

Moreover, this is an invisible area. You may have seen some hidden powers of some regions or objects in sci-fi movies. The magnetic field is a similar concept.

Speaking technically, this field is constructed by a particular movement. In this, an electric charge is moved, ultimately creating the magnetic lines and field. Or, more precisely, when electrons with a negative charge transfer in a particular way, it makes a magnetic region.

Magnetic field lines: What are they?

One important concept from this magnetic field is field lines. First, we discussed about how the magnetic region is generated. Now the question comes of how to determine this region. As this area is invisible, isn’t it challenging to define it?

Well, magnetic field lines make this possible. These lines show the direction of forces working in the field. Moreover, they can be treated as a visual representation of the magnetic field. In other words, these lines can literally make us ‘see’ the magnetic area. But how to interpret a magnetic field for a mathematical use?

And what is a magnetic field vector?

Let us understand how to define the magnetic field mathematically. The concept that can help you with it is field vector. This vector field is a set of many vectors. It has direction, length, and magnetic force.

How to measure magnetic field?

Another general query when discussing magnetism is about measuring the magnetic field. How can you measure this invisible magnetic field?

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To measure the magnetic field, we measure the strength of the field. In addition, we need to have the direction of the lines for this measurement. Let us understand this concept through an experiment.

One easy and fun experiment

Say you have one magnet and one piece of iron. Take the magnet in your left hand and the iron piece in your right hand. Now try to place these two objects or two of your hands in front of each other. Keep them aside for as long as possible. Then, try to get them closer slowly.

Now let us look at the observations of this experiment. When the hands with these two objects are away, you will feel no or less force. Then as you try to get your hands close to each other, you will soon try to feel the force. In addition, you will feel like the magnet is trying to attract the iron or vice versa.

Lastly, when there is very little distance between your hands or a magnet and iron, you will feel that there is a strong force between these two objects. You can even try this experiment in a reverse way. For example, try to keep the magnet and iron close and separate them slowly.

As a result, we can say that the closer the magnet and the object are, the higher the force or the stronger the field will be. The farther you go, the weak will be the field.

Magnetic forces

Another important concept related to the magnetic field is magnetic forces. You know that the magnet will either attract or repulse an object. The forces that allow this are magnetic forces.

First, let us talk about magnetic force. Basically, it is a part of electromagnetic force. It is the motion of charges that causes this magnetic force. However, one more concept can help you understand this force. The interaction of two magnetic fields causes this force.

This concept is not only critical theoretically. However, formulae can help you solve complex problems related to the magnetic field. The field intensity and field flux density can help you find the force. The strength of the field measures the field, and the vector H indicates the field. Therefore the formula will be as follows.

H=B/μ -M.

Let us understand what the other letters denote. As you know, H is the vector, M is magnetization, and B is the flux density. In this, μ is permeability.

Another formula is of Lorentz rule. You can find force by the Lorentz formula.


The unit of field intensity here is Tesla (T).


Physics concepts are vital for advanced science education. Also, it is helpful when students learn these concepts at an early age. Additionally, it forms a more profound base and becomes easy for students to learn and excel.

Moreover, when programs such as assessment in ecce help preschool students develop curiosity in science education, we can definitely focus on teaching them basic concepts as early as possible. So let us try and imbibe early science education!

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