Question

what is Tan A position of deflection magnetometer​

Answer 1

Explanation:

In tan-A position, the magnetometer is placed with its arm along the east-west direction and bar magnet is placed with its arm along the east-west direction and bar magnet is placed on one of the arms symmetrically along it pointing the north pole to the east or west direction.

Answer 2

Answer:

If a magnetometer and a bar magnet are placed in such way that this condition is satisfied, then this arrangement is called Tan A position. To achieve this, the arms of the deflection magnetometer are placed along East-West direction (i.e) perpendicular to the magnetic meridian.