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Polystyrene has dielectric constant 2.6 and dielectric strength 2.0 ×× 1077 V/mV/m. A piece of polystyrene...

Polystyrene has dielectric constant 2.6 and dielectric strength 2.0 ×× 1077 V/mV/m. A piece of polystyrene is used as a dielectric in a parallel-plate capacitor, filling the volume between the plates.

A) When the electric field between the plates is 79 %% of the dielectric strength, what is the energy density of the stored energy?

B) When the capacitor is connected to a battery with voltage 500.0 VV, the electric field between the plates is 79 %% of the dielectric strength. What is the area of each plate if the capacitor stores 0.250 mJmJ of energy under these conditions?

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