Answers to those Homework Problems that you must
write up and turn in at recitation (i.e. the HW
problems not on the Mastering Physics web site)
will be posted here.
E1.  proof
P25. For both components, the magnitude turns out
    to be k(lambda)/R
H1. (a) 693 kg/s         (b) 693 kg/s
    (c) 347 kg/s         (d) 347 kg/s
    (e) 575 kg/s
F38. (a) 3.51 MN/C down  (b) 0.79 MN/C down  (c) 0.79 MN/C up
     (d) top plate: top, -7 microC/m² bottom, +31 microC/m²
         bottom plate: top, -31 microC/m² bottom, -7 microC/m²
E2.  proof
W58. (a) 2.88x10^5 V
     (b) 0.107 microC from the 1st sphere to the 2nd
P66. (a) 200 kV/m  (b) 200 kV/m
     (c) 1.77 microC/m² (d) 4.60 microC/m²
     (e) -2.83 microC/m²
P10. (a) (1/3)AJ_0
     (b) (2/3)AJ_0 (you must explain why)
W72. proof
Suggested exercise from "Magnetic Field from Current Segments" Part D.
-(mu_0/(4*pi))*I*dl*z_1/(x_1^2+z_1^2)^1.5
W68. (a) (pi/3)R²J_0
     (b) (mu0/6r)R²J_0
     (c) (mu0/2)rJ_0(1-(2r/3R))
W48. (a) (mu0)I(sqrt(n²+(1/2piR)²))
     (b) INVtan(1/2(pi)nR)
F32. (a) Bmax = 175 microT; Bmin = 140 microT    <== these answers use
     (b) 0.141 microWb  (1 Wb = 1 T⋅m²)          Wolfson's value of rho_Cu
     (c) heating rate is 1.58 W; doesn't get very hot  (16.8 nOhms⋅m)
P20.  pi²a²Bf
W6.  (a) 7.20 x 10^{11} (V/m)/s
     (b) this answer will be posted after this 
         problem has been turned in
P28. (a) 1.89 pT
     (b) graph; at 10 cm, B = 0.565 pT
G3.  proof
G4.  proof