Name: ________________________ Class: ___________________ Date: __________
ID: A
Exam 1
Multiple Choice
Identify the choice that best completes the statement or answers the question.
____
____
____
1. Which of these is not a property of charge
a. induction
c. positive or negative
b. conservation
d. quantization
2. In this figure, a ball made of insulating material is attracted to a positively charged rod. What is the charge of
the ball?
a. negative
b. either positive or negative
3. What is the ratio of q 1/q2?
a.
b.
2
-2
c.
d.
not enough information
positive
c.
d.
-1/2
1/2
1
Name: ________________________
____
____
____
____
ID: A
4. This figure shows two charged particles separated by a distance of 2 cm. What is the force on Q 1?
a. -1100 N
c. 25 N
b. 13 N
d. 1100 N
5. This figure shows three charged particles at the corners of a triangle with equal sides of length a. Which
charged particle experiences the largest electric force due to the other 2 particles?
a. Q
d. not enough information given
b. all the same
e. 3Q
c. 2Q
6. A material is a conductor because
a. its protons move freely
d. its electrons are bound and can’t move
b. its protons are bound and can’t move
e. none of these
c. it has no neutrons
7. A proton and electron, initially separated from one another, are released from rest. Which will experience
the greater magnitude of force as they move towards one another?
a. proton
c. both will feel the same force
b. electon
d. it depends on their distance apart
2
Name: ________________________
____
ID: A
8. In this figure, the arrows represent the electric field vectors? Which of these describes the nature of the
charge q?
a. not enough information given
c. neutral
b. negative
d. positive
____ 9. Two particles have equal positive charges. They are separated by a distance of 0.01 m and exert a force of
1.47x10-22 N. What is the charge on these particles?
a. 8e
c. 12e
d. 1.6x10-36 C
b. 1.6x10-19 C
____ 10. If the distance l is 10 m, what is the net electric field due to Q 1 and Q2 at a point equidistant between the two
charges?
a. 92000 N/m
c. -88000 N/m
b. 18000 N/m
d. 88000 N/m
____ 11. A proton is suspended at a height of 1 m in an electric field that is directed upward. What is the magnitude
of the electric field?
a. 1.0x10-7 N/C
c. 0.7x10-9 N/C
-11
d. 1.4x10-9 N/C
b. 5.6x10 N/C
____ 12. An electron, initially at rest, is accelerated in an electric field of 500 N/C. What is the velocity of the
electron after traveling for 1.0x10 -5 seconds?
a. 8.8x108 m/s
c. 500x10-5 m/s
-17
d. 8.8x1013 m/s
b. 8.0x10 m/s
3
Name: ________________________
ID: A
____ 13. In this figure, which arrow best represents the direction of the net force on the particle whose charge is +Q?
a. 5
d. 1
b. 3
e. 4
c. 2
____ 14. You are sitting a certain distance from a point charge, and you measure an electric field of E o. If the charge
is doubled and your distance from the charge is halved, what is the new electric field that you measure?
d. Eo/4
a. Eo
b. 8 Eo
e. 4 Eo
c. Eo/8
____ 15. Which of these is not an allowable charge?
d. 1.6x10-19 C
a. 2.2x10-19 C
-19
b. 3.2x10 C
e. 10 µC
c. -3.2x10-19 C
____ 16. What is the equivalent capacitance of this arrangement of capacitors?
a.
b.
6.0 µF
25 µF
c.
d.
4
44 µF
8.5 µF
Name: ________________________
ID: A
____ 17. What is the charge on the 6.0 µF capacitor?
a. 810 µC
c. 29 µC
b. 11 µC
d. 110 µC
____ 18. In the figure for the above problem, what is the potential across the 6.0 µF capacitor?
a. 10 V
c. 18 V
b. 4.8 V
d. 1.8 V
____ 19.
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?
d=0.1 m.
a. 50000 F
b. 0.4 µF
c.
d.
5
0.04 µF
0.002 F
Name: ________________________
ID: A
____ 20. What is the potential at the point B if q1=2 µC and q2=3 µC?
a. 4x1011 V
c. 12 V
b. 4,000,000 V
d. 400,000 V
____ 21. In the figure for the previous question, how much work is required to move a charge of -4 µC from infinitely
far away to point B?
a. -2 J
c. 2 J
b. -20 J
d. 200 J
6
Name: ________________________
ID: A
____ 22. What is the energy stored in the capacitor C 1?
a. 1 nJ
c. 1000 J
b. 500 J
d. 0.5 nJ
____ 23. 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.
neither, they have the same KE
proton
c.
d.
7
not enough information
electron
Name: ________________________
ID: A
____ 24. What is the potential at the origin of the x- and y-axes?
a. not enough information
c. V>0
b. V<0
d. V=0
____ 25. These four charges are at the corner of a square. What pair of statements best describes the electric field and
potential at a point in the center of the square
a.
b.
E=0, V≠0
E=0, V=0
c.
d.
8
E≠0, V≠0
E≠0,V=0
Name: ________________________
ID: A
____ 26. 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?
c. C2
a. C1
b. it depends on other factors.
d. both have the same charge
____ 27. 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
____ 28. The correct answer to this question is “A.” Please write “Version A” next to your name on the scantron.
a. A
c. C
b. B
d. D
9
ID: A
Exam 1
Answer Section
MULTIPLE CHOICE
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