Bar Magnet - Uses, Pole Strength, Definition, Types, Properties, Classification,

The properties of a bar magnet have always fascinated us since we were children. When orientated in a specific way, it attracts small particles of iron scraps and nails while repelling another magnet. We will study bar magnets in particular, their properties, and other related issues in depth in this brief post.

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This Story also Contains

1. Classification Of Magnets:
2. What Is Bar Magnet?
3. Types Of Bar Magnets:
4. Properties Of Bar Magnet
5. Magnetic Field Lines Of A Bar Magnet
6. Differences Between Electromagnets And Bar Magnets
7. Bar Magnet Uses
8. Summary

Classification Of Magnets:

Natural and manmade magnets are classified based on their gain of Magnetism, how long they can show their magnetic abilities and their magnetic field. Natural magnets are weaker than manmade magnets and can be found in nature.

1. Natural magnets - Natural magnets have a weak magnetic field and are found in nature. Natural magnets are commonly found in lodestones.
2. Artificial magnets — Artificial magnets have a stronger magnetic field and can be manufactured by man-made techniques. They can also be shaped to fit your needs. A bar magnet is an artificial magnet that has been formed into a bar shape.

What Is Bar Magnet?

A bar magnet is a rectangular section of an object that has permanent magnetic qualities and is made of iron, steel, etc. The ferromagnetic substance which has two poles, one north as well as one south, when suspended freely, magnet aligns so that the northern pole faces Earth's magnetic north pole due to Earth's magnetic field. A freely suspended bar magnet rests in the north-south direction. The magnetic lines of force inside a bar magnet are from the south pole to the north pole of the magnet. The magnetism at the centre of a bar magnet is Zero. The bar magnet diagram is given below.

Types Of Bar Magnets:

A bar magnet can be one of two types:

1. A cylindrical rod, commonly known as a rod magnet, has a thickness equal to or more than the diameter, allowing it to have a high magnetism property. These bar magnets are used in instructional, experimental, and research applications.
2. Rectangular bar magnets are used in the manufacturing and engineering industries because they have a higher magnetic strength and field than other magnets.

Related Topics,

• Magnetic Moment
• Magnetic Dipole Moment
• Magnetic Susceptibility

Properties Of Bar Magnet

The qualities of a permanent magnet are similar to those of a bar magnet.

1. The two ends consist of the North Pole and the South Pole. Even if you split a bar magnet in half, both portions will have a north pole and a south pole, regardless of how many pieces you break it into.
2. It has the strongest magnetic force at the pole.
3. If a thread is used to suspend this magnet in the air, it will not come to rest until the poles are oriented north-south. This attribute is used by a Mariner's Compass to determine direction.
4. 4. When two bar magnets are positioned near together, their unlike poles attract each other while their like poles repel each other.

Pole Strength:

The ability of a magnetic pole to draw magnetic materials towards itself is known as magnetic pole strength.

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Magnetic Field Lines Of A Bar Magnet

Let's do the following task to help us grasp the notion of magnetic field lines. Let's put some iron filings on a piece of paper and sandwich a bar magnet between them. When we tap the paper, the fillings organize themselves in the manner illustrated in the bar magnet diagram below.

The magnetic field lines that encircle this bar magnet may be seen in the patterns of the filings.

Magnetic field lines are imaginary lines that can be drawn along any magnetic substance. Magnetic field lines have unique characteristics. The number of magnetic field lines passing through a closed surface is known as magnetic Flux.

1. A magnet's magnetic field lines create continuous closed loops.
2. The direction of the net magnetic field B at any place is represented by the tangent to the field line.
3. The magnitude of the magnetic field B is proportional to the number of field lines crossing per unit area.
4. The lines of the magnetic field do not cross.

Differences Between Electromagnets And Bar Magnets

Although electromagnets and bar magnets have similar magnetic fields, they are different in the following ways:

Bar Magnet Uses

1. In the laboratory, bar magnets are employed as stirrers for magnetic studies.
2. They can also be used in medical operations.
3. Magnets are used in electronic devices such as telephones, radios, and television sets.
4. Bar magnets are used in a variety of industries for collecting loose metals and preserving the magnetism of other magnets.

Alnico and Neodymium bar magnet

A discussion on bar magnets would be incomplete without mentioning Alnico and Neodymium bar magnets. Aluminium, nickel, cobalt, and iron are the main ingredients in Alnico magnets. These magnets can produce a high magnetic field and maintain that field even in the presence of intense heat. Magnets consisting of neodymium, boron, and iron are known as neodymium bar magnets. Both magnets are really powerful, but they are also extremely fragile.

Also, check-

• NCERT Exemplar Class 11th Physics Solutions
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Summary

Bar magnets are ferromagnetic materials which are used to generate the magnetic field. Bar magnets are widely used in everyday applications. In this article, we discussed the classification of the bar magnet, bar magnet definition, bar magnet uses, properties of bar magnet, and types of bar magnet.