Walker, Halliday & Resnick — Capacitance: Problem 22

22 Figure 25-26 shows a parallel-plate capacitor of plate area \( A = 12.5 \text{ cm}^2 \) and plate separation \( 2d = 7.12 \text{ mm} \). The left half of the gap is filled with material of dielectric constant \( \kappa_1 = 21.0 \); the top of the right half is filled with material of dielectric constant \( \kappa_2 = 42.0 \); the bottom of the right half is filled with material of dielectric constant \( \kappa_3 = 58.0 \). What is the capacitance?