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Magnetism can be considered an integral part of Electromagnetism. However the use of bar magnets as practical devices and more importantly the concept of dipole moment are necessary for more concise formulation of magnetism.

As far as repulsion and attraction between like and unlike poles respectively and the mathematical expression for the force between fictitious poles are concerned there is a close similarity between Electrostatics and Magnetism. The poles of a magnet are called fictitious because the isolated North and South poles are not known to exist. (The Grand Unification Theory predicts the existence of monopoles and claims have been made for their experimental detection but these claims have not been accepted unequivocally so far.)

The isolated poles otherwise are totally analogous to free electric charges.

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20.1 Coulomb's Law
20.2 Magnetic Field
20.3 Torque on a bar-magnet
20.4 Gauss's Law

Chapter 21

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