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Why we have to keep the arms of deflection magnetometer on east west direction in TanA position..?

Why we have to keep the arms of deflection magnetometer on east west direction in TanA position..?

Grade:12

1 Answers

Aarti Gupta
askIITians Faculty 300 Points
9 years ago
In this position arms of magnetometer are perpendicular to the magnetic meridian and deflection magnetometer works on the principle of tangent law according to which when two uniform magnetic fields act as right angels to each other on a magnetic needle,it comes to rest in the direction of resultant field B = BH tan theta where,
B= magnetic induction due to bar magnet
BH = horizontal component of earth's magnetic field
theta = angel through which the needle is deflected
Thanks & Regards
Aarti Gupta
askiitians Faculty

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