Chapter 24
32. 563 nJ/m³
Chapter 26
12. 25 Ohm - 7.00 A; 20 Ohm - 9.95 A
58. 8.60 V
84. (a) 7.10 J
    (b) 3.62 kW
    (c) 1.81 kW
Fishbane Problems - Chapter 28
57. proof
Halliday 2nd Ed Problems - Chapter 29
22. (a) by integration, U_C = (1/2)C(EMF)² and
        energy out from battery = C(EMF)²
    (b) by integration, heat from resistor = (1/2)C(EMF)²
Chapter 29
 2. (a) before - 14.4 micro Wb; after - zero
    (b) 0.360 mV
 6. (a) 0.0302 V + (0.302 mV/s³)t³  (originally mistyped)
    (b) 0.113 mA                   (corrected 1:24 PM 7/26)
24. (a) 3.00 V
    (b) towards top of page
    (c) 0.800 N to the right
    (d) 6.00 W for each
27. (c) 530 microN/C  (the units to this answer were originally)
    (d) counterclockwise         (posted incorrectly)
32. (a) 950 microV
    (b) 109 microH
54. (a) (mu_0)i/(2pir) into page
    (b) L(mu_0)i(dr)/(2pir)
    (c) ln(b/a)L(mu_0)i/(2pi)
    (d) ln(b/a)L(mu_0)(di/di)/(2pi)  CCW
    (e) 0.506 microV
76. (a) from a to b
    (b) (Rmg)tan(phi)/(L²B²cos(phi))
    (c) (mg)tan(phi)/(LB)
    (d) Rm²g²tan²(phi)/(L²B²)
    (e) same answer as in (d) by a different method
Wolfson - Chapter 30
42. (a) (mu0)J(|z|)           (b) (mu0/2)Jh
48. (a) (mu0)I(sqrt(n²+(1/2piR)²))
    (b) INVtan(1/2(pi)nR)
57. proof; out of the page
58. proof; out of the page
68. (a) (pi/3)R²J_0 
    (b) (mu0/6r)R²J_0
    (c) (mu0/2)rJ_0(1-(2r/3R))
HRW PROBLEM SUPPLEMENT #1 - CHAPTER 30
73. (a) 4.8 mT
    (b) 0.933 mT
    (c) zero
Fishbane Problems - Chapter 30
32. (a) Bmax = 174 microT; Bmin = 139 microT    <== these answers use
    (b) 0.140 microWb  (1 Wb = 1 T⋅m²)              HRW's value of rho_CU
    (c) heating rate is 1.57 W; doesn't get very hot   (16.9 nOhms⋅m)
    (a) Bmax = 175 microT; Bmin = 140 microT    <== these answers use
    (b) 0.141 microWb  (1 Wb = 1 T⋅m²)              Wolfson's value
    (c) heating rate is 1.58 W; doesn't get very hot  (16.8 nOhms⋅m)
    (a) Bmax = 171 microT; Bmin = 137 microT    <== these answers use
    (b) 0.138 microWb  (1 Wb = 1 T⋅m²)              Y&F's value
    (c) heating rate is 1.54 W; doesn't get very hot  (17.2 nOhms⋅m)
Halliday 2nd Ed Problems - Chapter 30
 9. (a) 20 min
    (b) 59.4 m(N⋅m)
22. (a) 3750 m/s
    (b) drawing
29. (a) 2.60 x 10^6 m/s
    (b) 0.109 microseconds
    (c) 141 keV
    (d) 70.3 kV
31. (-11.4 N/C)i - (6 N/C)j + (4.8 N/C)k
Chapter 30
18. (a) 4.35 mT
    (b) 7.53 J/m³
    (c) 1.52 microm³
    (d) 11.4 microJ
    (e) 3.65 microH
    (f) same as (d) by a different method
44. (a) (23.4 V)sin((240pi rad/s)t) plus a graph
    (b) max EMF = 23.4 V; zero
    (c) max I = 124 mA; zero
50. (a) (mu_0)i/(2pir)
    (b) [(mu_0)i/(2pir)]l(dr)
    (c) [(mu_0)i(l)/(2pi)]ln(b/a)
    (d) proof
    (e) [(mu_0)i²(l)/(4pi)]ln(b/a)
58. (a) proof
    (b) will be posted after this problem is due
60. (a) 24.0 mV
    (b) 1.55 mA
    (c) 72.1 nJ
    (d) Q = 5.20 microC; U_L = 18.0 nJ
64. (a) will be posted after this problem is due
    (b) will be posted after this problem is due
66. (a) will be posted after this problem is due
    (b) will be posted after this problem is due
    (c) 5.63 microC; long after S is closed
68. (a) 894 microC
    (b) 20.0 mJ
    (c) graph
70. (a) i1 = 1.50 A; i2 = 1.80 A
    (b) 2.40 A
Halliday 2nd Ed Problems - Chapter 31
 5. proof
25. (a) 78.5 microT     (b) 1.08 microN⋅m
Chapter 31
32. (a) 945 rad/s
    (b) 70.6 ohms
    (c) resistor - 120 V; capacitor - 450 V;
        inductor - 450 V
Wolfson - Chapter 32
 9. ((mu_0)l/2pi)ln((a+w)/w)
Halliday 2nd Ed Problems - Chapter 32
 7. 0.452 V
HRW PROBLEM SUPPLEMENT #1 - CHAPTER 32
28. (a) 1.89 pT
    (b) graph; at 10 cm, B = 0.565 pT
38. (a) (4/3) A  
    (b) at R/4 and at 4R
Chapter 32
14. 15.9 microJ
50. 61.4 kV/m and 205 microT
Halliday 2nd Ed Problems - Chapter 33
11.  (a) 238.7 W  (b) 154.8 W  (c) 393.5 W
12.  (a) 18.7 J   (b) 5.10 J   (c) 13.6 J
Fishbane Problems - Chapter 33
46.  DiffEq is -I(t)R - L(dI/dt) = 0
HRW PROBLEM SUPPLEMENT #1 - CHAPTER 33
50.  100 V  (you must carefully explain why)
HRW PROBLEM SUPPLEMENT #1 - CHAPTER 34
 6.  4.74 m
Wolfson - Chapter 34
 6.  (a) 7.20 x 10^{11} (V/m)/s
     (b) increasing
52.  3.50 gauss
G1 and G2: proofs