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從?????????近??候?磁場??來?大??此??了??電流?此電流????????而?,?就是?謂?渦電流。此??也???一????????近?磁鐵??,?此?磁鐵?????而?緩??????度?這就??謂??次定???/p>
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Fundamentals of Physics, Halliday
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