BONUS: Energy Storage Consider the capacitor as a device for storing energy. The practical limitation on the potential difference between the plates of a capacitor is the dielectric strength of the dielectric material between the plates. This is the maximum electric field strength that can exist without causing a spark. It is typically on the order of 107 V/m for a good liquid dielectric with x = 2.3 and p 1g/cm³. (a) Neglecting the weight of the electrodes and case, what is the energy density of a capacitor filled with a liquid dielectric, in J/kg? L.e., how many joules of energy can be stored per kilogram of dielectric fluid? (b) The energy density of gasoline is about 46 MJ/kg, and gasoline has a density of about 0.75 g/cm³. Assume a gas tank holds about 12 gallons of gasoline when full. What mass of dielectric would be required to provide the same energy as a tank of gasoline?

b. Capacitor A and Capacitor B are two parallel plate capacitors. Capacitor B has twice the area and four times distance between plates of Capacitor A. (i) What is the ratio CB: CA, and (ii) What is the ratio of Energy stored UB:UA when the capacitors store the same charge on its plates?

First box choices are 4, 3, 6, 1, 2 (V) the second box choices are 1, 8, 3, 1.5, 6 (nJ) and the third box pick from I-V

Two parallel plate capacitors are connected to a 60 V battery as shown. C₁ is air filled and C₂ uses a dielectric material with relative permittivity/dielectric constant of -2.6. Each capacitor has a plate area of A = 80 cm² and a plate separation of 3.0 mm. a) Find the charge Q on the plates of by C₁ and C2. b) The energy stored by C₁, C2 and total energy stored. + 60V C₂ *Indicate all assumed voltage polarities C₁