Here are very quickly worked-out answers to the sample
exam questions.  If you get what I do, we're probably
correct.  If you don't, then I'm probably wrong.  
Buyer beware!

1. 10.8x10^6 cal; 90396s = 25.11 hr; R=24.2 ohms; $1.26.

2. 0.437m

3. (a) Phi_B = 0.0157 Wb; I(t)=0
   (b) I(t)=6.28x10^-4(1+t) amps

4. B = mu_0 r I_1 / (2 pi R^2) for r < R
   B = mu_0 I_1/ (2 pi r) for r >= R.

5. E=0 for r<R_1
   E = Q/(4 pi epsilon_0 r^2) for r >R_1
   delta W = Q/(16 pi epsilon_0 R)

6. Q = 90 C; C = 1.77x10^-7 F; V = 5x10^7 V; U = 2.2x10^8 J

7. C = 7.04x10^-3 F;  ...a range of frequencies from 400 - 750 nm.

8. t = 1.3 x 10^-7 m and multiples.

9. lambda = 500 nm.

10. epsilon/epsilon_0 = 2.38

11. d_i = 2.67m;  m = -1.9

12. d_i = -3.33cm;  m = 1.67

13. 47.1 degrees below horizontal

14. d_i = 6cm; d_o = 3cm.

15. E = sigma a / (epsilon_0 r); B = mu_0 sigma a omega.

16. 25uC on 5uF capacitor; 15uC on 3uF capacitor; 10uC on 2uF
capacitor; time constant = 6 us.