Electrical Engineering ⇒ Topic : Laws of magnetic force
Laws of Magnetic Force
Charles Coulomb, a French scientist observed that when two **isolated poles are placed near each other, they experience a force. He performed a number of experiments to study the nature and magnitude of force between the magnetic poles. He summed up his conclusions into two laws, known as Coulomb's laws of magnetic force. These laws give us the magnitude and nature of magnetic force between two magnetic poles
Like poles repel each other while unlike poles attract each other
The force between two magnetic poles is directly proportional to the product of their pole strengths and inversely proportional to the square of distance between their centres.
Consider two poles of magnetic strength m1 and m2 placed at a distance d apart in a medium as shown in Fig. (a). According to Coulomb's laws, the force between the two poles is given by
where K is a constant whose value depends upon the sun-ounding medium and the system of units employed. In SI units, force is measured in newtons, pole strength in *weber, distance in metres and the value of K is given by
Unit of pole strength. By unit pole strength we mean 1 weber. It can be defined from Coulomb's laws of magnetic force. Suppose two equal point poles placed 1 m apart in air exert a force of 62800 newtons i.e.
Hence a pole of unit strength (i.e. 1 Wb) is that pole which when placed in air 1 m from an identical pole, repels it with a force of 62800 newtons.
where d is a unit vector to indicate the direction of d.
LAWS 0F MAGNETIC FORCE
Coulomb, through his experiments found that the force between two magnetic poles placed in a medium is
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