Question

A student has a bright idea for a generator that apparently generates electric energy without a corresponding loss of energy somewhere else. His suggested arrangement is shown in Fig. 20.31. The magnet is initially pulled down and released. When the magnet is attached to a spring, the student thinks that there should be a continuous electrical output as the magnet oscillates. What is wrong with this idea?


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  • CreatedAugust 29, 2015
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