Procedure
Procedure for real lab
To find mBH
The direction of BH is drawn on the table using a compass needle. The box-type vibration magnetometer is placed with its length parallel to this direction. The bar magnet is then suspended horizontally in the vibration magnetometer with its north pole pointing north. The magnet is set into vibration by momentarily bringing another bar magnet near to it. The time taken for 10 oscillations is determined twice and the mean of t is to be found and period of oscillation (T) can be calculated using equation(2). The mass of the magnet is determined. The length and breadth of the magnet are measured by using vernier calipers. The moment of inertia of the magnet is calculated. From these observations, the value of mBH is calculated using equation(5).
To find m/BH