Physics 202 – Second Exam February 24, 2005
Ignore the sign of the answer.
Answer ‘e’ is to be used as ‘none of the above’, ‘cannot be answered’, etc
You may not have a cell phone or any electronic device (other than a non-programmable
calculator with one memory and two pencils. You may not have any paper even blank or
notes at your seat.
You are to take your test questions home with you and only submit your answer sheets.
The +z direction is out of the paper toward your face and +x is to your right, +y up the
page.
Water has an index of refraction of 1.33 and glass has and index of refraction of 1.5.
1. Imagine you are in a room with a uniform magnetic field of 12 T toward the front
of the room. There is a rectangle of wire (one strand) measuring 2 m by 3 m at an
angle of 25 degrees (for its normal) with the magnetic field. What is the flux
through the loop? a. 72 b. 18 c. ~ 65
d. 24
2. If this coil turns at a rate where the angle increases to 90 degrees in 4 seconds,
then what is the emf generated by the system? a. ~16 b. 36 c. 4.5 d. 12
3. Whose law is applicable to this last problem? a. Gauss
b. Ampere c. Lentz
d. ~ Faraday
4. If this loop is replaced by a rectangular box with the other dimension being ¼ m
then what will be the total flux through the box. a. 1.5
b. 18 c. 12 d. ~ 0
5. What is the value the reciprocal of the square root of the product of o and o? a.
~ 3E8
b. 8E3 c. 0 d. 4Pi * 1E-7
6. Which of the following has the shortest wave length? a. green light
b.
microwaves c. ~ gamma rays d. short wave radio
7. If an inductor of 6 Henries, with a square cross section of 4 m2, has a current of 36
Amps change to 18 Amps in a time of 8 seconds, then what voltage results from
this change? a. ~ 13.5
b. 16 c. 5184 d. 648
8. How much energy was originally stored in the inductor? a. ~ 3,888
b. 5184
c. 648 d. 16
9. A transformer has an input of 4 amps and 36 volts on the input side with 100 turns
and the output side has 400 turns. What is the output voltage? a. ~ 144
b. 9
c. 36 d. 12
10. What is the output current in amps? a. 16 b. 36 c. 1/4 d. ~ 1
11. What is the output power? a. 0 b. 36 c. 12 d. ~ 144
12. If a laser beam approaches an air-water interface at an angle of 33 degrees from
the air side, with what angle will the beam continue into the water? a. 0.36
b.
0.4 c. 21.3 d. ~ 24.2
13. What is the angle of total internal reflection in water? a. 48 b. ~49 c. 42
d. 41
14. What is the speed of light in water? a. ~ 2.26E8 b. 3E8 c. 1.13E8 d. 0
15. As you take a picture of someone, they are at a distance of 20 ft from your camera
lens which has a diameter of 1/18 ft, and the image focus distance from the lens is
1/12 ft. What is the focal length of the lense? a. 12
b. 6 c. 0.083 d. 1/4
16. What was the magnification of the image in the last problem? a. ~0.0042
b. 6
c. 0.18 d. 36
17. A thin lens has a diameter of 2 in and a focal length of 5 in with an object of 36 in
high at an object distance of 27 in. What is the strength of the lense? a. ~0.20
b. 8 c. 5 d. 360
18. What is the f number of the lens? a. 0.40 b. ~2.5 c. 10 d. 0.10
19. What is the speed of the lens? a. 0.40
b. 2.5 c. 0.10 d. ~ 0.16
20. What is the unit for the strength of a lens? a. Henry b. Tesla c. ~Diopter
d. Micrometer
21. Compute using the first two terms: sin(0.2) a. 0.1996
b.
c. ~0.1987 d.
0.0035
22. Compute e0.3 using the first 3 terms: a. 1.350
b. 1.348 c. ~1.345 d. 1.352
23. Which name is NOT used with one of Maxwells equations? a. Gauss b. Faraday
c. ~Lenz d. Ampere
24. Which of the ‘Maxwell equations’ was modified by Maxwell? ? a. Gauss b.
Faraday c. Lenz d. ~ Ampere
25. A the functionality of a lens depends upon ? a. reflection b. ~ refraction c.
dispersion d. interference
26. In a comparison between the harmonic oscillator and the RLC circuit, what does
C correspond to in the mechanical equation? a. k b. ~ 1/k c. m d. 1/m
27. In a RLC circuit if the values are R= 0, L= 8, C= ½ then what is the angular
frequency of the system? a. 2 b. 4 c. 1.412 d. ~ 0.5
28. Such a system would be called a. overdamped b. critically damped c.
~underdamped d. infinitely damped
29. If a RLC system has values of R = 4 and C = 2 then if a system has an initial
charge of 6 Coulombs (and no battery is attached) what is the charge after 3
seconds? a. 0.67 b. 2.43 c. ~ 4.12 d. 1.18
30. Enter the last answer again (counts double) a. 0.67 b. 2.43 c. ~ 4.12 d. 1.18