Answers to the even-numbered assigned problems in Chapts 17--18
The following is a list of the answers to the even-numbered assigned problems.
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Chapter 17
17.10
(a) +3.64 μC
(b) 0.200 N, downward
17.12
(a) -4.82 × 104 C
(b) 9.28 × 1018 N, attractive
17.14
(a) 7.42 × 10-7 C; 7.42 × 10-7 C
(b) 3.71 × 10-7 C; 1.48 × 10-6 C
17.34
(a) 432 N/C, downward
(b) 1.50 m
17.42
(a) Ex = Ey = E = 0
(b) Ex = 2660 N, Ey = 0; E = 2660 N/C, +x direction
(c) Ex = 130 N, Ey = -510 N/C; E = 526 N/C, at 284° counterclockwise from +x axis
(d) Ex = 0, Ey = +1380 N/C; E = 1380 N/C, +y direction
17.64
(a) inner: zero; outer: +16 nC
(b) inner: +11 nC; outer: +5 nC
17.72
(a) Q = +5.53 × 10-10 C
(b) Q = -3.05 × 10-9 C
Chapter 18
18.4 -0.357 J
18.12 1.58 mm
18.16
(a) 1.50 × 10-6 J
(b) +357 V
(c) 5.95 × 103 V/m
18.22
(a) -737 V
(b) -704 V
(c) 8.2 × 10-8 J
18.24
(a) 1.36 × 104 m/s; far apart
(b) 2.45 × 1017 m.s2; just after released
18.38
(a) 1.00 × 104 V
(b) 22.6 cm2
(c) 8.00 pF
18.44
a) d = 1.00 cm, r = 4.24 cm
(b) 500 pC
18.54
(a) 22.4 μC, 22.4 μC, 44.8 μC, 67.2 μC
(b) 5.6 V, 5.6 V, 11.2 V, 16.8 V
18.64
(a) 24.2 μC
(b) 35 nF: 7.7 μC; 75 nF: 16.5 μC
(c) 2.66 mJ
(d) 35 nF: 0.85 mJ; 75 nF: 1.81 mJ
(e) 220 V
18.70 0.0106 m2
18.78 2.27 × 10-14 m
18.82
(a) 2.21 × 10-11 F
(b) 2.65 × 10-9 C
(c) 7.50 × 103 V/m
(d) 1.59 × 10-7 J