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Assessment
Chapter 16 test review
Teacher Notes and Answers
Electric Forces and Fields
CHAPTER TEST A (GENERAL)
1.
2.
3.
4.
5.
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21.
23. 2.3  108 N; attractive
Given
b
b
a
a
b
b
b
c
d
c
b
d
a
d
b
d
b
a
insulators
field
qe  e  1.60  1019 C
q p  e  1.60  1019 C
r  1.0  1010 m
kC  8.99  109 N  m2/C2
Solution
24. 1.6  108 N
Given
qe = e = 1.60  1019 C
qnucleus = +19e = +3.04  1018 C
r = 5.2  1010 m
kC = 8.99  109 Nm2/C2
Solution
22. field
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Solution
25. 0.91 m
Given
rA,B = 2.2 m
rC,A = d
rC,B = 2.2 m  d
qA = 1.0 C
qB = 2.0 C
qC = 2.0 C
FC,A = FC,B = 0 N
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Chapter Tests
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Chapter Test A
MULTIPLE CHOICE
In the space provided, write the letter of the term or phrase that best completes
each statement or best answers each question.
1. What happens when a rubber rod is rubbed with a piece of fur, giving it a
negative charge?
a. Protons are removed from the rod.
b. Electrons are added to the rod.
c. Electrons are added to the fur.
d. The fur is left neutral.
2. A repelling force occurs between two charged objects when the charges
are of
a. unlike signs.
c. equal magnitude.
b. like signs.
d. unequal magnitude.
3. An attracting force occurs between two charged objects when the charges
are of
a. unlike signs.
c. equal magnitude.
b. like signs.
d. unequal magnitude.
4. When a glass rod is rubbed with silk and becomes positively charged,
a. electrons are removed from the rod.
b. protons are removed from the silk.
c. protons are added to the silk.
d. the silk remains neutral.
5. Electric charge is
a. found only in a conductor.
b. conserved.
c. found only in insulators.
d. not conserved.
6. Charge is most easily transferred in
a. nonconductors.
c. semiconductors.
b. conductors.
d. insulators.
7. The process of charging a conductor by bringing it near another charged
object and then grounding the conductor is called
a. contact charging.
c. polarization
b. induction.
d. neutralization.
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Chapter Test A continued
8. The figure shown on the right demonstrates
charging by
a. grounding.
c. polarization.
b. induction.
d. contact.
9. Both insulators and conductors can be
charged by
a. grounding.
c. polarization.
c. induction.
d. contact.
10. A surface charge can be produced on
insulators by
a. grounding.
c. polarization.
b. induction.
d. contact.
11. Conductors can be charged by
a. grounding
c. polarization
b. induction
d. contact
, while insulators cannot.
12. Which of the following is not true for both gravitational and electric
forces?
a. The inverse square distance law applies.
b. Forces are proportional to physical properties.
c. Potential energy is a function of distance of separation.
d. Forces are either attractive or repulsive.
13. Electric field strength depends on
a. charge and distance.
b. charge and mass.
c. Coulomb constant and mass.
d. elementary charge and radius.
14. What occurs when two charges are moved closer together?
a. The electric field doubles.
b. Coulomb’s law takes effect.
c. The total charge increases.
d. The force between the charges increases.
15. Resultant force on a charge is the
forces on that charge.
a. scalar
b. vector
c. individual
d. negative
sum of individual
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Chapter Test A continued
16. The electric field just outside a charged conductor in electrostatic
equilibrium is
a. zero.
b. at its minimum level.
c. the same as it is in the center of the conductor.
d. perpendicular to the conductor’s surface.
17. For a conductor that is in electrostatic equilibrium, any excess charge
a. flows to the ground.
b. resides entirely on the conductor’s outer surface.
c. resides entirely on the conductor’s interior.
d. resides entirely in the center of the conductor.
18. If an irregularly shaped conductor is in electrostatic equilibrium, charge
accumulates
a. where the radius of curvature is smallest.
b. where the radius of curvature is largest.
c. evenly throughout the conductor.
d. in flat places.
SHORT ANSWER
19. Materials, such as glass, in which electric charges do not move freely are
called electrical
.
20. Any force between two objects that are not touching is called a(n)
force.
21. Draw the lines of force representing the electric field surrounding two objects
that have equal magnitude charges of opposite polarity.
22. The space around a charged object contains an electric
.
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Chapter Test A continued
PROBLEM
23. What is the electric force between an electron and a proton that are separated
by a distance of 1.0  1010 m? Is the force attractive or repulsive?
(e = 1.60  1019 C, kC  8.99  109 Nm2 /C2)
24. An electron is separated from a potassium nucleus (charge 19e) by a distance
of 5.2  1010 m. What is the electric force between these particles?
(e = 1.60  1019 C, kC = 8.99  109 Nm2/C2)
25. Charge A and charge B are 2.2 m apart. Charge A is 1.0 C, and charge B is
2.0 C. Charge C, which is 2.0 C, is located between them and is in electrostatic
equilibrium. How far from charge A is charge C?
26 . find the total force acting on q0 from this diagram .
if F1 = 3 N
F2 = 10 N
F3 = 4 N
The angle is 20 0
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