One type of project associated with these devices involves improving their dynamic range. The range is defined as the periodic movement of the suspended object as it moves up and down. Devices with wider dynamic ranges will allow the objects they suspend to move greater distances within the field. In order to determine when the dynamic range is the greatest, use a ruler to measure how far the object travels as it oscillates back and forth.
Disturbance rejection refers to the ratio between the heaviest object levitated and the lightest object levitated in a system with a constant number of magnets and a constant configuration. Systems with better disturbance rejections will be able to lift the greatest range of objects with respect to their weight. Try to design a system with the greatest disturbance rejection possible.
Consider a project whereby you improve the system so that it can lift heavier and heavier objects. The aim should be to maximize the amount of weight your system can levitate. Try doing this with one, two and three magnets at a time. Results are determined by weighing the heaviest object successfully levitated.
Consider creating a project whereby your system is able to lift a magnetized object of a pre-determined weight using the least amount of energy possible. Results of the experiment can be measured using an ammeter.