A) always in the direction of resultant of earth
B) always with its axis along E-W
C) along N-S in tan A position
D) always along N-S
Correct Answer: B
Solution :
The tangent law on which the principle of working of a deflection magnetometer is based, slates, when two magnetic field F and H act as right angles, then these two fields defects through an angle \[\theta \] which is related. \[F=H\sin \theta \] Earths field is always along the directions of East West direction, therefore the magnet must always be placed with its axis along the direction of East West.
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