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Two air-filled, parallel-plate capacitors are to be connected to a 10 V battery, first individually, then...

Two air-filled, parallel-plate capacitors are to be connected to a 10 V battery, first individually, then in series, and then in parallel. In those arrangements, the energy stored in the capacitors turns out to be, listed least to greatest: 225 μJ, 300 μJ, 900 μJ, and 1200 μJ. Of the two capacitors, what is the (a) smaller and (b) greater capacitance?

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