Chapter 30
 2. drawing
20. drawing
12. (mu_0)h/2 parallel to sheet; perp to current
32. (a) 171 microT; 137 microT
    (b) 0.138 microWb
    (c) rate of heat production = 1.54 J/s
38. 168 nT
40. B_square = (mu_0)(2sqrt2)I/(pi)L;
    B_square/B_circle = 0.9
46. for ratio of 0.90, x = 0.270 R;
    for ratio of 0.10, x = 1.91 R
52. zero
54. (a) 25 V/s
    (b) 5.65 Nm²/Cs; 5 microA
58. (mu_0)h²/2  attractive
62. 0.603 N attractive
Chapter 31
 4. 92.3 nW
 6. graph
12. at t = 0, I = 0; at t = T/4, I is clockwise;
    at t = T/2, I = 0; at t = 3T/4, I is clockwise
16. Br_0(alpha)/R_0(1+(beta)t);
    clockwise looking down with B out of page,
    and current loop in plane of page
30. 24.1 microV away from the wire
42. I'=(2(pi)r²(mu_0)nI_0/Rt_0)e^(-t/t_0)
44. inside E = -R(mu_0)n(omega)I_0cos(omega t)/4;
    outside E = -R(mu_0)n(omega)I_0cos(omega t)/4
46. R = 11.3 cm
50. 3.59 m/s
54. (a) left
    (b) counter-clockwise
    (c) 1.8 A
Chapter 32
12. 9.29 x 10^{-24} Am²
Chapter 33
 2. L/volume = (mu_0)n²
 8. L_eq = L_1 + L_2
18. L = ((mu_0)N²h/2(pi))ln((R+w)/R);
    for R>>w, L = (mu_0)N²A/l
32. (a) L = 9.01 mH
    (b) U = 11.3 microJ
40. (a) u_B = (mu_0)I²r²/8(pi²)a^4
    (b) U_B/length = (mu_0)I²/16(pi)
42. 351 - 3510 ohms
46. I=(V/R)e^(-Rt/L)
50. 1.52x10^{13} Hz
52. Imax = q/sqrt(LC); t_max = (n+(1/2))(pi)sqrt(LC)
                               where n=0-infinity
56. 1.79 ohms
60. proof; E = Q_0²/2C
62. Imax = 224 mA; Qmax = 200 microC; Imin = Qmin = 0
64. proof
Chapter 34
 2. 67.8 M$
 4. 0.417 A
18. (a) t = (n+(1/2))8.33 ms + 2.78 ms;
             n = 0 to infinity
    (b) t = (n+(1/2))8.33 ms - 1.39 ms;
             n = 0 to infinity
40. C = 1/2(pi)fR; L = R/2(pi)f
47. ANSWER IN BOOK IS WRONG!!
    (a) (EMF_m)²R/2(omega²)L² 
              --> 0 as omega --> infinity
    (b) (1/2)(EMF_m)²R(omega²)C² 
              --> 0 as omega --> 0
    NOTE: the book uses V_0 for what I call EMF_m
Chapter 14
14. (a) 2.09 m
    (b) 0.318 Hz
    (c) .4 m
    (d) 3.14 s
    (e) 3 m^{-1}
Chapter 15
 8. (a) proof
    (b) A = 10 cm; f = 1.5 Hz
Chapter 35
12. proof
16. B = (0.667nT)cos(kz-wt) in the -i direction
        with k = .0314/m and w = 9.42 M rad/s;
        where w stands for omega
22. E = 0.268 V/m @ 5 km, B = 0.894 nT;
    E = 0.0134 V/m @ 100 km, B = 44.7 pT
24. 3.33 mN
26. 192 W/m²
32. <u> = 2.90 nJ/m³ ; Erms = 18.1 V/m; 
                       Brms = 60.4 nT
45. ANSWERS IN BOOK ARE WRONG! At least according
    to the picture in my copy of the text.  The
    correct answers are:
    (a) j  (b) i  (c) -k  
    (d) dir of E = -j, B = -i, S = -k
    NOTE: No information is given that allows
    us to distinguish between the two sets of
    answers.  You could just as correctly have
    (a) -j (b) -i with the E and B in (d) made
    positive.
48. 0.211
52. I = (I_0)0.096