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A parallel plate capacitor whose capacitance \( \mathrm{C} \) is \( 14 \mathrm{pF} \) is charged by a battery to a potential difference
P \( \mathrm{V}=12 \mathrm{~V} \) between its plates. The charging battery is now
W) disconnected and a porcelin plate with \( \mathrm{k}=7 \) is inserted between the plates, then the plate would oscillate back and forth between the plates with a constant mechanical energy of.
pJ. (Assume no friction)
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