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A bar magnet is said to have magnetic pole strength +qm and - qm at the north and south poles, respectively.
A bar magnet is said to have magnetic pole strength +qm and - qm at the north and south poles, respectively.
The separation of magnetic poles inside the magnet is 2l.
The separation of magnetic poles inside the magnet is 2l.
As the bar magnet has two poles, with equal and opposite pole strength, it is called a magnetic dipole.
As the bar magnet has two poles, with equal and opposite pole strength, it is called a magnetic dipole.
This is analogous to an electric dipole.
This is analogous to an electric dipole.
The magnetic dipole moment, therefore, becomes mq l m ur r .2 (2l is a vector from south pole to north pole) in analogy with the electric dipole moment.
The magnetic dipole moment, therefore, becomes mq l m ur r .2 (2l is a vector from south pole to north pole) in analogy with the electric dipole moment.
SI unit of pole strength (qm) is A m.
SI unit of pole strength (qm) is A m.
SI unit of magnetic dipole moment m is A m2.
SI unit of magnetic dipole moment m is A m2.
Axis:-
Axis:-
It is the line passing through both the poles of a bar magnet.
It is the line passing through both the poles of a bar magnet.
Obviously, there is only one axis for a given bar magnet.
Obviously, there is only one axis for a given bar magnet.
Equator:-
Equator:-
A line passing through the centre of a magnet and perpendicular to its axis is called magnetic equator.
A line passing through the centre of a magnet and perpendicular to its axis is called magnetic equator.
The plane containing all equators is called the equatorial plane.
The plane containing all equators is called the equatorial plane.
The locus of points, on the equatorial plane, which are equidistant from the centre of the magnet is called the equatorial circle.
The locus of points, on the equatorial plane, which are equidistant from the centre of the magnet is called the equatorial circle.
The popularly known ‘equator’ in Geography is actually an ‘equatorial circle’.
The popularly known ‘equator’ in Geography is actually an ‘equatorial circle’.
Such a circle with any diameter is an equator.
Such a circle with any diameter is an equator.
Magnetic length (2l):- It is the distance between the two poles of a magnet.
Magnetic length (2l):- It is the distance between the two poles of a magnet.
Magnetic length (2l) = (5/6)× Geometric length
Magnetic length (2l) = (5/6)× Geometric length
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