1. Drag the B-field to the coil, the side(s) lying inside the field will be acted by magnetic force(s).

2. The position and the size of the field region can be varied by dragging its centre or sides.

3. To avoid electromagnetic induction, the circuit is broken when the B-field or the number of turns is varied.

4. The scale reading is the net vertical force (downward minus upward).

5. When the switch "Total - Zero" is turned to "Zero", the scale reading will become zero. Any reading shown afterwards is the force added after the switching. "N" and "mN" are units of force; they stand for newton and millinewton respectively.

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