Question

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?

Step 1

**(Part A)**

The electric field strength between the plates with 81% of dielectric strength can be calculated as,

Step 2

Write the expression for the energy density of the stored energy.

Step 3

The energy density of the stored energy in polystyrene capacit...

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