4. Sketch the following complete circuits, using the symbols shown in Figure 17.5:

(a) two ideal 6.0-V batteries in series wired to a capacitor followed by a resistor;

(b) two ideal 12.0-V batteries in parallel, connected as a unit to two resistors in series with one another;

(c) a nonideal battery (one with internal resistance) wired to two capacitors that are in parallel with each other, followed by two resistors in series with one another.