A parallel plate capacitor whose capacitance C is 14 pF is charged by a battery to a potential difference V = 12 V between its plates. The charging battery is now disconnected and a porcelin plate with 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)
Option: 1 864
Option: 2 34
Option: 3 28
Option: 4 76
and
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