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Between the plates of a parallel-plate capacitor there is a metallic plate whose thickness takes up \( \eta=0.60 \) of the capacitor gap. When that plate is absent the capacitor has a capacity \( C=20 \mathrm{nF} \). The capacitor is connected to a dc voltage source \( V=100 \mathrm{~V} \). The metallic plate is slowly extracted from the gap. Find:
the mechanical work performed in the process of plate extraction.
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