|CHAPTER 20 : MAGNETISM
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
The isolated poles otherwise are totally analogous to free
20.1 Coulomb's Law
20.2 Magnetic Field
20.3 Torque on a bar-magnet
20.4 Gauss's Law
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