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Unit 9: Electrostatics
Electrostatics Problem Set 2
1. What is the current in a wire if 3.4 × 1019 electrons
pass by a point in this wire every 60. seconds?
A) 1.8 × 10–18 A
C) 9.1 × 10–2 A
B) 3.1 × 10–11 A
D) 11 A
2. What is the current through a wire if 240 coulombs
of charge pass through the wire in 2.0 minutes?
A) 120 A
C) 0.50 A
B) 2.0 A
D) 0.0083 A
3. The current through a lightbulb is 2.0 amperes.
How many coulombs of electric charge pass
through the lightbulb in one minute?
A) 60. C
C) 120 C
B) 2.0 C
D) 240 C
4. One coulomb per second is equal to one
A) watt
C) volt
B) ohm
D) ampere
5. When a neutral metal sphere is charged by contact
with a positively charged glass rod, the sphere
A) loses electrons
C) loses protons
B) gains electrons
D) gains protons
6. A device commonly used to detect the presence of
a static electric charge is
A) a galvanometer
C) a compass
B) a voltmeter
D) an electroscope
7. When an electroscope is charged by contact, the
charging body always gives the electroscope
A)
B)
C)
D)
a charge opposite that of the charging body
the same charge as the charging body
a negative charge
a positive charge
8. Which procedure will give an electroscope a
positive charge?
A) touching the electroscope with a neutral
object
B) bringing a positively charged object near the
electroscope
C) touching the electroscope with a negatively
charged object
D) touching the electroscope with a positively
charged object
9. If an uncharged electroscope is touched with a
neutral object, the separation of the leaves of the
electroscope will
A) decrease
B) increase
C) remain the same
Unit 9: Electrostatics
10. A positively charged object was used to give an
electroscope a negative charge. The electroscope
was charged by
A) contact
C) induction
B) conduction
D) reduction
13. A positively charged rod is held near the knob of
a neutral electroscope. Which diagram best
represents the distribution of charge on the
electroscope?
A)
11. When a positively charged body touches a neutral
body, the neutral body will
A) gain protons
C) gain electrons
B) lose protons
D) lose electrons
12. Base your answer to the following question on An
electroscope is a device with a metal knob, a
metal stem, and freely hanging metal leaves used
to detect charges. The diagram below shows a
positively charged leaf electroscope.
As a positively charged glass rod is brought near
the knob of the electroscope, the separation of the
electroscope leaves will
A) decrease
C) remain the same
B) increase
B)
C)
D)
Unit 9: Electrostatics
14. In the diagram below, a cloth is brought near, but
does not touch a neutral electroscope. The
electroscope leaves separate. What charge, if any,
does the cloth have?
A)
B)
C)
D)
a positive charge
a negative charge
an unknown charge
no charge
15. When a rod is brought near a neutral
electroscope, the leaves diverge. Which statement
best describes the charge on the rod?
A)
B)
C)
D)
It must be positive.
It must be negative.
It may be neutral.
It may be positive or negative.
16. Which diagram best represents the charge
distribution on a neutral electroscope when a
negatively charged rod is held near it?
A)
B)
C)
D)
17. Conductivity in metallic solids is due to the
presence of free
A) nuclei
C) neutrons
B) protons
D) electrons
18. Electrical insulators are used to resist the flow of
A) atoms
C) neutrons
B) molecules
D) electrons
19. In the diagrams of charged objects shown below,
which diagram correctly represents the direction
of flow of electrons when the objects are
connected by a conductor?
A)
B)
C)
D)
Unit 9: Electrostatics
20. If an insulator replaces a conductor in an
electrical circuit, the flow of electrons in the
circuit will be
A) less
C) the same
B) greater
Answer Key
Tuckahoe Electrostatics Prob Set 5
1.
C
2.
B
3.
C
4.
D
5.
A
6.
D
7.
B
8.
D
9.
C
10.
C
11.
D
12.
B
13.
D
14.
C
15.
D
16.
C
17.
D
18.
D
19.
C
20.
A