In order for a material to have a large dielectric constant, its molecules must be ....
Answer: "electrically polar". That means that the molecule should have a positively charged end and a negatively charged end.
A parallel plate capacitor with air between its plates has a capacitance of 5 microFarads. It is charged to 6 Volts. How much energy does it store?
Answer: 0.5 * C * V^2 = 9 x 10^(-5) Joules
The same capacitor has the space between its plates filled with a material of dielectric constant kappa = 4. It is again charged to 6 Volts. How much energy does it store now?
Answer: kappa * 0.5 * C * V^2 = 36 x 10^(-5) Joules
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