Question

A parallel-plate capacitor has square plates that are 7.00cm on each side and 4.20mm apart. The…

A parallel-plate capacitor has square plates that are 7.00cm on each side and 4.20mm apart. The space between the plates is completely filled with two square slabs ofdielectric, each 7.00cm on a side and 2.10mm thick. One slab is pyrex glass and the other is polystyrene.

If the potential difference between the plates is 73.0V , how much electrical energy is stored in the capacitor?
Express your answer with the appropriate units.

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