Define the term, magnetic field, uniform magnetic field, magnetic poles, magnetic axis, magnetic equator, and magnetic length with reference to a bar magnet

Define the term, magnetic field, uniform magnetic field, magnetic poles, magnetic axis, magnetic equator, and magnetic length with reference to a bar magnet

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In this article, we are going to discuss some important definitions of terms related to bar magnets. So let’s get started…

Some important definitions linked to the bar magnet is given below:

Magnetic field?

The magnetic field is the region around any magnetic material in which magnetic influence can be experienced. It is denoted by a capital letter (B) and its unit is Tesla denoted by capital (T).

Uniform magnetic field

A magnetic field in any region is said to be uniform if it has the same magnitude and direction at all the points in that region. At any place, the magnetic field due to earth is considered uniform. But the magnetic field due to a bar magnet is not uniform because the magnetic field due to a bar magnet is not the same at all points. Magnetic fields are strongest at the poles of the bar magnet.

Define the term, magnetic field, uniform magnetic field, magnetic poles, magnetic axis, magnetic equator, and magnetic length with reference to a bar magnet
Fig. 1, uniform magnetic field, magnetic field outward and magnetic field inward, source: esaral.com

A uniform magnetic field acting in the plane of paper is illustrated by the equidistant parallel lines. If a uniform magnetic field is acting perpendicular to the plane of the paper and directed outward then it is represented as dots but if a uniform magnetic field is acting perpendicular to the plane of the paper and directed inward then it is represented as crosses.

Magnetic poles

Magnetic poles are the region of apparently concentrated magnetic strength inside the magnet, where the magnetic attraction is maximum. The magnetic poles didn’t lie at the end of geometrical length but somewhat inside the magnet.

Magnetic axis

The lines passing through the poles of a magnet are called the magnetic axis.

Magnetic equator

The line passing through the center to the magnet and perpendicular to the magnetic axis is called the magnetic equator.

Magnetic length

Define the term, magnetic field, uniform magnetic field, magnetic poles, magnetic axis, magnetic equator, and magnetic length with reference to a bar magnet
fig. 3, illustration of different definitions, source: toppr

The distance between the two poles of a magnet is called magnetic length. It is slightly less than the geometric length of the magnet. Geometric length is the complete length of the magnet. It is found that the ratio of magnetic length and geometric length is equal to 0.84.

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