Deflection Magnetometer
It is a device used to determine M and H . Its working is based on tangent law . Deflection magnetometer can be used into two settings
( i ) Tangent A setting In this setting the arms of the magnetometer are along east-west and magnet is parallel to the arms .
In equilibrium B = H tan θ μ o / 4π 2M / d 3 = H tan θ
( ii ) Tangent B setting In this setting the arms of the magnetometer are along north-south and magnet is perpendicular to these arm in equilibrium
μ o / 4π M / d 3 = H tan θ In above setting the experiment can be performed in two ways .