Discussion
Match the mechanism with the arrangement in which it dominates.
1. Motional emf 2. Transformer emf 3. Displacement current
P. A capacitor on an alternating supply Q. A rotating machine R. A stationary coil on a changing flux
Answer: D
Each of the three is the leading effect in one familiar piece of apparatus, and recognising which applies tells at once which term of Maxwell's equations is doing the work. All three can be present together, as they are in a rotating machine at high frequency.
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