Chapter 4: Q40E (page 811)
Polystyrene has dielectric constant 2.6 and dielectric strength . 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 80% 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 V, the electric field between the plates is 80% of the dielectric strength. What is the area of each plate if the capacitor stores 0.200 mJ of energy under these conditions?
Short Answer
- The the energy density of the stored energy when electric field is 80% of the dielectric strength is .
- The area of the plates when the stored energy is 0.200 mJ is .