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It's working is based on the principle of tangent law. It consist of a small compass needle, pivoted at the centre of a circular box. The box is kept in a wooden frame having two meter scale fitted on it's two arms. Reading of a scale at any point directly gives the distance of that point from the centre of compass needle.
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Different position of deflection magnetometer: Deflection magnetometer can be used according to two following positions.
Tan A position
Arms of magnetometer are placed along E-W direction such that magnetic needle is acted upon by only horizontal component of earth's magnetic field as shown
Tan B position
It a bar magnet is placed on one arm with it's length parallel to arm, so magnetic needle comes under the influence of two mutual perpendicular magnetic field (i) and (ii) Axial magnetic field of experimental bar magnet.
In equilibrium 
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(M= Magnetic moment of experimental bar magnet)
Arms of magnetometer are placed along N-S direction such that magnetic needle align itself in the direction of earth's magnetic field (i.e. as shown.
If a bar magnet is placed on one arm with it's length perpendicular to arm, so magnetic needle comes under the influence of two mutual perpendicular magnetic fields (i) and (ii) equatorial magnetic field of experimental bar magnet.
In equilibrium  and
=> 
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