Name: ________________________ Class: ___________________ Date: __________
ID: A
Exam 1--PHYS 102--S09
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
____
1. Which force vector (labeled a-e in this figure) best represents the net force on the 2 nC charge due to the -3
and +6 nC charges?
a. a
d. d
b. b
e. e
c. c
2. A proton is accelerated in an electric field of 1000 N/C. If the proton is initially at rest, what is the proton’s
displacement after 1x10 -3 seconds?
a.
b.
48,000 m
8.8x1013 m
c.
d.
1
9.6x1010 m
1.6x10-16 m
Name: ________________________
____
____
ID: A
3. This figure shows three charges. The charge q 2 has a charge of -10 nC. What is the charge of q 3?
a. -10 nC
d. +20 nC
b. +8 nC
e. +5 nC
c. +10 nC
4. This figure shows how particles a and b respond to one another and, separately, how a and c respond to one
another. Which of these statements is true:
a.
b.
a & b are like charges
a & c are opposite charges
c.
d.
2
b & c are opposite charges
b & c are like charges
Name: ________________________
____
____
ID: A
5. In this figure, a ball made of conducting material is attracted to a positively charged rod. What is the charge
of the ball?
a. positive
c. either negative or neutral
b. negative
d. either positive or negative
6. This figure shows two charged particles separated by a distance of 2 cm. What is the force on Q2?
a.
b.
-1100 N
1100 N
c.
d.
3
25 N
13 N
Name: ________________________
____
7. A proton and electon are in a constant E-field as shown. You release an electron and proton at a point
equidistant between the plates. Which particle has more kinetic energy when they strike the plates?
a.
b.
____
ID: A
proton
neither, they have the same KE
c.
d.
not enough information
electron
8. An ion accelerated through a potential difference of 100.0 V has its potential energy increased by
1.6x10-17 J. Calculate the charge on the ion.
a.
b.
c.
6.25x1018 C
-1.6x10-19 C
1.6x10-19 C
d.
e.
4
1.6x10-15 C
-1.6x10-15 C
Name: ________________________
____
ID: A
9. What is the potential at point P in this figure?
a. -50 V
c. 260,000 V
b. 475,000 V
d. 2.6x109 V
____ 10. Which of these statements is true at the point P, which is at the center of this square?
a.
b.
E=0, V=0
Ε≠0, V≠0
c.
d.
5
Ε≠0, V=0
Ε=0, V≠0
Name: ________________________
ID: A
____ 11. In which of the following diagrams is the potential along the x-axis equal to zero?
a. a
d. none of these
b. b
e. all of these
c. c
____ 12. The following graph is for potential (V) versus position (x). If an electron is released at point A, what
direction will it move?
a.
b.
c.
it will oscillate around point B
to the left
it will be stationary
d.
e.
6
to the right
none of these
Name: ________________________
ID: A
____ 13. What is the potential across the circled 8.00 µF capacitor?
a. 36 V
c.
b. 18 V
d.
____ 14. What is the equivalent capacitance of this circuit?
a.
b.
3.5 µF
24 µF
c.
d.
7
72 V
12 V
18 µF
4.0 µF
Name: ________________________
ID: A
____ 15. What is the charge on the 4 µF capacitor?
a.
b.
60 µC
40 µC
c.
d.
100 µC
13 µC
____ 16.
This figure shows a capacitor with plates of area A=1 m 2 and distance between the plates d=0.0002 m. If an
insulator, whose dielectric constant is 10, is placed between the plates, what is the capacitance?
a. 0.04 µF
c. 0.002 F
b. 0.4 µF
d. 50000 F
____ 17. Capacitor C1 is connected across a battery of 5V. An identical capacitor, C 2 , is connected across a battery of
2 V. Which capacitor has the most charge?
a. both have the same charge
c. C2
b. C1
d. it depends on other factors.
____ 18. Two wires, A and B, are made of the same metal and have equal length, but the resistance of wire A is four
times the resistance of wire B. How do their diameters compare?
1
a.
dA=4dB
d.
dA= 4 dB
b.
dA=2dB
e.
dA= 2 dB
c.
dA=dB
8
1
Name: ________________________
ID: A
____ 19. When you rotate the knob of a light dimmer switch, what is being changed:
I. Current
II. Power
III. Voltage
IV. Resistance
a. I, II, & IV
c. I, III, & IV
b. I & II
d. III
____ 20. Two space heaters in your room operate at 120 V. Heater 1 has twice the resistance of heater 2. Which
heater carries the greater current?
a. Heater 1
c. Both the same
b. Heater 2
d. Not enough information
____ 21. A 20 V potential difference is maintained across a 10 Ω resistor for a period of 30.0 s. What total charge
passes through the wire in this time interval?
a. 20 C
c. 60 C
b. 15 C
d. 600 C
____ 22. Entergy charges its customers $0.14 per kilowatt•hour. How much does it cost to run a 60 W lightbulb for
12 hours?
a.
b.
$0.08
$0.24
c.
d.
9
$1.01
$0.10
Name: ________________________
ID: A
____ 23. A current of 20 A flows through a wire of length 1 m and cross-sectional area 7.85x10 -7 m2. The potential
across the wire is 1.4 V. From this table of resistivities, select the material of the wire:
Material
Copper
Silver
Gold
Tungsten
Iron
Resistivity(Ohm-m)
1.7x10-8
1.59x10-8
2.44x10-8
5.5x10-8
10.0x10-8
a. Copper
d. Tungsten
b. Silver
e. Iron
c. Gold
____ 24. A 3 V potential difference is maintained across a 10 Ω resistor for 2 minutes. How many electrons pass
through the material?
a. 3.75x1018
d. 60
b. 0.3
e. 36
20
c. 2.25x10
____ 25. A 50Ω resistor is hooked up to a power supply of 150 V. What amount of energy is dissipated across the
50Ω resistor in 3 seconds?
a. 1350 J
b. 150 J
____ 26. This is Version B. Bubble B for this test.
a. A
b. B
c.
d.
90 J
450 J
c.
d.
C
D
10
ID: A
Exam 1--PHYS 102--S09
Answer Section
MULTIPLE CHOICE
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