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Magnetic Field Strength

The force experienced on a unit (one weber0 N-pole placed d metres apart from another pole f strength m webers in a medium of relative permeability  μr is given by F =     m        newtons, and is known as
the magnetic field strength at that point. It is represented by H.

Hence the magnetic field intensity at any point is defined as the force experienced a unit north pole, when placed at hat point.

i.e.    H =    m         newtons / wb.

The force experienced by a pole of m webers placed n a uniform magnetic filed of intensity H newtons/weber, will be equal to mH newtons.
Magnetic field intensity is a vector quantity.

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