8. In figure below $C_1 = 5.00 \, \mu F$, $C_2 = 10.00 \, \mu F$, $C_3 = 15.00 \, \mu F$, $C_4 = 20.00 \, \mu F$, and $C_4 = 25.00 \, \mu F$
a. What is the equivalent capacitance of this circuit.
(10pt.)
b. The capacitor network is connected to an applied potential difference $V_{ab}$. After the charges on the capacitors have reached their final values, the voltage across $C_2$ is 40.0 V. What is the charge on the plate of $C_3$? (5pt.)
c. The capacitor $C_4$ is made up of rectangular plates of dimension 2cm X 5cm filled with air. What is the separation between the plate of this capacitor. (5pt.)