Laws of Magnetizing Force
- Let us consider that the two magnet poles are placed in a medium.
- The m1 and m2 is
magnetic strength of the two poles, r is distance between them and µ is absolute permeability of the
surrounding medium. The force ( F ) between them is
( 1 ) Directly proportional to product of their pole
strengths
F α m1m2
( 2 ) Inversely proportional to square of distance between
two poles
F α ( 1 / r2 )
( 3 ) Inversely proportional to absolute permeability of the
surrounding medium
F α ( 1 / µ )
Therefore
F α m1m2 / µr2
F = k m1m2 / µr2
Where k = Constant
The value of k = 1 / 4π in the SI system
F = m1m2 / 4π
µr2 ( Where k = 1 / 4π )
F = m1m2 / 4π
µ0 µrr2 ( Where µ = µ0 µr )
F = m1m2 / 4π
µ0 µrr2 ….… ( 1 )
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Unit Magnetic Pole
- Let us consider magnetic pole strength m1 = m2 = m
- Distance between two poles r = 1
- Force between two magnetic pole F = 1 / 4π
µ0
Putting above
value in the equation ( 1 )
1 / 4π µ0 = m2 / 4π µ0
m2 =
1
m = ± 1
- The unit
magnetic pole is defined as the two poles of opposite polarity having same mass
which when placed in air with a distance between them is 1 meter, with a force
of 1 / 4π µ0 newtons.
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