Sunday, July 13, 2008

Permanent magnets - Laws

Tangent law of perpendicular fields

External magnetic field B may be written in terms horizontal component of earth’s magnetic field BH and deflection of compass needle θ.

B = BH tan θ

Gauss’s law for magnetism

B.dS = µ0*minside0

But minside0 is zero as we do not have an isolated magnetic pole in nature. The smallest unit of the source of magnetic field is a magnetic dipole where the net magnetic pole is zero.

Hence Gauss’s law for magnetism states that

B.dS = 0

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