Halliday, Resnick & Walker — Capacitance: Problem 31

31 Figure 25-30 shows a parallel-plate capacitor with a plate area \( A = 7.89 \text{ cm}^2 \) and plate separation \( d = 4.62 \text{ mm} \). The top half of the gap is filled with material of dielectric constant \( \kappa_1 = 11.0 \); the bottom half is filled with material of dielectric constant \( \kappa_2 = 4.0 \). What is the capacitance?