Review Questions

6.1 What charge is on a 5-F capacitor when it is connected across a 120-V source?

(a) 600 C	(b) 300 C
(c) 24 C	(d) 12 C

6.2 Capacitance is measured in:

(a) coulombs	(b) joules
(c) henrys	(d) farads

6.3 When the total charge in a capacitor is doubled, the energy stored:

(a) remains the same	(b) is halved
(c) is doubled	(d) is quadrupled

6.4 Can the voltage waveform in Fig. 6.42 be associated with a real capacitor?

(a) Yes (b) No

Figure 6.42

For Review Question 6.4.

6.5 The total capacitance of two 40-mF series-connected capacitors in parallel with a 4-mF capacitor is:

(a) 3.8 mF	(b) 5 mF	(c) 24 mF
(d) 44 mF	(e) 84 mF

6.6 In Fig. 6.43, if i = cos 4t and v = sin 4t, the element is:

(a) a resistor (b) a capacitor (c) an inductor

For Review Question 6.6.

6.7 A 5-H inductor changes its current by 3 A in 0.2 s. The voltage produced at the terminals of the inductor is:

(a) 75 V	(b) 8.888 V
(c) 3 V	(d) 1.2 V

6.8 If the current through a 10-mH inductor increases from zero to 2 A, how much energy is stored in the inductor?

(a) 40 mJ	(b) 20 mJ
(c) 10 mJ	(d) 5 mJ

6.9 Inductors in parallel can be combined just like resistors in parallel.

(a) True \t\t (b) False

6.10 For the circuit in Fig. 6.44, the voltage divider formula is:

(a)

v_1 = \frac{L_1 + L_2}{L_1} v_s

\n(b) $v_1 = \frac{L_1 + L_2}{L_2} v_s$
\n(c) $v_1 = \frac{L_2}{L_1 + L_2} v_s$
\n(d) $v_1 = \frac{L_1}{L_1 + L_2} v_s$
\n $v_s$

For Review Question 6.10.

Answers: 6.1a, 6.2d, 6.3d, 6.4b, 6.5c, 6.6b, 6.7a, 6.8b, 6.9a, 6.10d.