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Write the mathematical form of tangent law in magnetism.

According to Tangent Law, when magnet is suspended under the combined action of two uniform magnetic fields of intensities F and  H, acting at 900 to each other, the magnet comes to rest making an angle θ with the direction of H, such that  F = H tan θ.
 

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Tangent Law of Magnetism:

The law states that, if a magnetic field 'B' is applied at right angles to the horizontal component of the earth's field BH, the needle comes to equilibrium at an angle`theta` to the magnetic meridian such that,

tan`theta` =`(B)/(Bh)`.

The tangent law is used for comparing the magnetic fields which are mutually perpendicular and hence to compare the magnetic moments of two bar magnets using Deflection Magnetometer.

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