For t 0 the current through a 0.22- mF capacitor is iC(t) 6 sin(1000pt) mA.

For t  0 the current through a 0.22- mF capacitor is iC(t) ¼

6 sin(1000pt) mA. Plot vC(t) versus time when vC(0) ¼ 10 V. [Hint: In OrCAD use the ISIN source — the frequency is in Hz—and set the other parameters appropriately. Use the Property Editor to set the capacitor’s initial condition to —

10 V. Then plot the output using the transient function. Place a huge, 1000MEG resistor in parallel with the capacitor to avoid ‘‘floating nodes’’. Caution: In OrCAD rotating the capacitor to make it vertical places the capacitor’s number 2 terminal at the top. In the identification of an initial voltage on the capacitor, the applied polarity of the voltage is between the number 1 terminal (considered positive) and the number 2 terminal (considered negative). Hence, the capacitor needs to be ‘‘flipped vertically’’ to place the desired

—10 V across the capacitor.]