physics multiple choice question help please

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j.1.2
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Q6.In which one of the following applications does electromagnetic induction not take place?
A the generators at a nuclear power station
B the ac power adapter for a laptop computer
C the wings of an aircraft cutting through the Earth’s magnetic field
D the back up capacitor of an electric time

Answer is D. Can someone explain why?
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username3442196
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because it has nothing to do with em induction! There's no change of flux linkage, no magnetism at all.
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