The diagram represents a system of four capacitors connected to a voltage source at nodes a and b. The voltage across the 5-uF capacitor is 90 volts. 5.0 F = 10v 10.0 F 9.0 ob 8.0 F a. How much energy is stored in the 8-uF capacitor? b. How much charge is stored on the positive plate of the the 9-pF capacitor? c. What voltage difference is applied from node a to node b? d. What is the equivalent capacitance of this system between nodes a and b? (Hint: you can use your answers to b. and c.)