You have a parallel plate capacitor with Capacitance 140 F, connected to a battery with EMF of 14 V. You then increase the distance between the parallel plates by 50% while keeping it connected to the battery.

a) How much energy is initially stored by the capacitor?

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b) How much energy is stored by the capacitor after the distance between the plates has been increased ?

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c) How much work has gone into charging the battery?

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d) How much mechanical work did you have to do to separate the plates?

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