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If one views the animations referenced in the Figure 43, one can get an intuitive feel for why in one case (gradient in the magnetic field of the coils) there is a force on the dipole and why in the other case (homogeneous magnetic field of the coils) there is not. This will be more immediate in the real-time virtual experiment driven by the data from the on line experiment. In particular, the student will be able to switch from one configuration to the other, and see the immediate response in the motion of the magnet, reflecting the immediate change in the configuration of the magnet fields. Although the passive animations we have linked to below are much more elegant than the real-time visualization, the real-time visualization will be reasonably attractive (see Figure 2), and has the great advantage that the student can interact with it by changing the experiment parameters.
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