# Part a and b Please. Polystyrene has dielectric constant 2.6 and dielectric strength 2.0×10^7 V/m. A piece of polystyrene is used as a dielectric in a parallel-plate capacitor, filling the volume between the plates. Part A When the electric field between the plates is 81 % of the dielectric strength, what is the energy density of the stored energy? Part B When the capacitor is connected to a battery with voltage 500.0 V, the electric field between the plates is 81 % of the dielectric strength. What is the area of each plate if the capacitor stores 0.20 mJ of energy under these conditions?

Question

Polystyrene has dielectric constant 2.6 and dielectric strength 2.0×10^7 V/m. A piece of polystyrene is used as a dielectric in a parallel-plate capacitor, filling the volume between the plates.

Part A
When the electric field between the plates is 81 % of the dielectric strength, what is the energy density of the stored energy?

Part B
When the capacitor is connected to a battery with voltage 500.0
V, the electric field between the plates is 81 % of the dielectric strength. What is the area of each plate if the capacitor stores 0.20 mJ of energy under these conditions?

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### Electric Charges and Fields 