Question: A parallel plate capacitor has square plates that are 5.00 cm on each side and 3.80 mm apart. The space between the plates is completely filled with 2 squares slabs of dielectric, each 5.00 cm on a side and 1.90 mm thick. One slab is pyrex glass and the other is polystyrene.
Part A: If the potential is 78V, how much electrical energy is store in the capacitor?
I need help to find how much electrical energy is store in the capacitor.