Halliday, Resnick & Walker — Capacitance: Problem 11

11 A dielectric material is to fill the space in a capacitor. Initially, with only air in place, the capacitance is $8.0\text{ pF}$. With the dielectric material in place, the capacitor should store $3.2\text{ }\mu\text{J}$ at a maximum potential difference of $350.8\text{ V}$. (a) What dielectric constant is required? (b) Of the materials in Table 25-1, which material should be used?