Physics questions

a) Four {4) capacitors are arranged as shown in Figure 2. If the charge in the capacitor C1, C2 and C3 are 15 uF, 20 uF and 30 pF respectively and the voltage between point A and B is 12 V, calculate the equivalent capacitance between point A and C. 01 C: 6"\"le C: Figure 2 b] Evaluate the impact on the capacitance of a capacitor after inserting dielectric material with a higher dielectric constant, K