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Electrostatics Review
1. When a neutral metal sphere is charged by contact with a
positively charged glass rod, the sphere
A) loses electrons
C) loses protons
Base your answers to questions 9 and 10 on the information and
diagram below.
B) gains electrons
D) gains protons
Two small metallic spheres, A and B, are separated by a
distance of 4.0 × 10–1 meter, as shown. The charge on each
sphere is +1.0 × 10–6 coulomb. Point P is located near the
spheres.
2. A glass rod is given a positive charge by rubbing it with silk.
The rod has become positive by
A) gaining electrons
C) losing electrons
B) gaining protons
D) losing protons
Base your answers to questions 3 and 4 on the diagram below which represents a system consisting of
two charged metal spheres with equal radii.
9. What is the magnitude of the electrostatic force between the two
charged spheres?
3. If spheres A and B, as represented in the diagram, were touched
together and then separated, the net charge on the two spheres
would
A) decrease
C) remain the same
B) increase
4. If the two spheres were touched together and then separated, the
charge on sphere A would be
A)
C)
B)
D)
A) 2.2 × 10–2 N
C) 2.2 × 104 N
B) 5.6 × 10–2 N
D) 5.6 × 104 N
10.Which arrow best represents the direction of the resultant
electric field at point P due to the charges on spheres A and B?
A)
B)
C)
D)
5. A particle could have a charge of
A)
C)
B)
D)
6. A positively charged glass rod attracts object X. The net charge
of object X.
A)
B)
C)
D)
11. An electron is located 1.0 meter from a +2.0-coulomb charge,
as shown in the diagram below.
may be zero or negative
may be zero or positive
must be negative
must be positive
7. Which procedure will give an electroscope a positive charge?
A)
B)
C)
D)
touching the electroscope with a neutral object
bringing a positively charged object near the electroscope
touching the electroscope with a negatively charged object
touching the electroscope with a positively charged object
8. An electric force F exists between two charged spheres. If the
quantity of charge on each sphere is doubled, the electric-force
between the two spheres will be equal to
A)
B) 2F
C) 3F
D) 4F
The electrostatic force acting on the electron is directed
toward point
A) A
B) B
C) C
D) D
Electrostatics Review
12. The diagram below shows two metal spheres charged to +1.0
× 10-6 coulomb and +3.0 × 10-6 coulomb, respectively, on
insulating stands separated by a distance of 0.10 meter.
15. Two isolated charges, +q and +2q are 4 centimeters apart. If F
is the force acting on the charge +q, what is the magnitude and
direction of the force on the charge +2q?
A)
B)
C)
D)
E)
F toward charge +2q
F away from charge +2q
2F toward charge +2q
F away from charge +q
2F away from charge +q
Base your answers to questions 16 through 18 on the
following:
The spheres are touched together and then returned to their
original positions. As a result, the magnitude of the
electrostatic force between the spheres changes from 2.7 N to
A) 1.4 N
B) 1.8 N
C) 3.6 N
D) 14 N
13. Two point charges attract each other with a force of Newton. If the distance between the charges is doubled, the
force will become
A)
C)
B)
D)
14. The distance between an electron and a proton is varied.
Which pair of graphs best represents the relationship between
gravitational force, Fg, and distance, r, and the relationship
between electrostatic force, Fe, and distance, r, for these
particles?
A)
A neutron, a proton, and an electron are initially at the same
distance from a relatively large stationary nucleus moving at a
constant velocity. Assume the masses of the proton and
neutron are equal.
16. Which particle experiences the greatest acceleration?
A)
B)
C)
D)
the neutron
the proton
the electron
the electron and the proton experience the same
acceleration
E) the neutron and the proton experience the same
acceleration
17. Which particle experiences the greatest force?
A)
B)
C)
D)
E)
the neutron
the proton
the electron
the electron and the proton feel the same force
the proton and the neutron feel the same force
18. Which is the first particle to reach the nucleus?
B)
C)
A)
B)
C)
D)
E)
the neutron
the proton
the electron
both the neutron and the proton reach it simultaneously
all three reach at the same time
19. An electron placed between oppositely charged parallel plates A and B moves toward plate A, as represented in the diagram
below
D)
What is the direction of the electric field between the plates?
A) toward plate A
C) into the page
B) toward plate B
D) out of the page
Electrostatics Review
26. Which diagram represents the electric field lines between two
small electrically charged spheres?
A)
20. In the diagram above, what is the force a small negative test
charge of magnitude z would feel at point P?
B)
A) 12kqz
25r2
B) –396kqz
25r2
C) 4kqz
3r2
D) –4kqz
3r2
E) 0
C)
Base your answers to questions 21 through 24 on the diagram below which shows two parallel metal plates A
and B connected to a voltage source.
D)
27. What is the magnitude of the electric field intensity at a point
where a proton experiences an electrostatic force of magnitude
2.30 × 10–25 newton?
A) 3.68 × 10–44 N/C
C) 3.68 × 106 N/C
21. As a charged object moves from plate A to plate B, the electric
force on the charged object
A) decreases
C) remains the same
B) increases
B) 1.44 × 10–6 N/C
D) 1.44 × 1044 N/C
Base your answers to questions 28 and 29 on the accompanying diagram which represents two large parallel
plates which are oppositely charged. A, B, and C are reference
points.
22. What is the electric field intensity between the two plates?
A) 400. N/C
C) 625 N/C
B) 500. N/C
D) 4,000 N/C
23. If only the original source voltage is increased, the electric
field intensity between the plates will
A) decrease
C) remain the same
B) increase
24. If only the distance between the plates is increased, the electric
field intensity between the plates will
A) decrease
C) remain the same
B) increase
25. Gravitational field strength is to Newtons per kilogram as
electric field strength is to
A) coulombs per joule
C) joules per coulomb
B) coulombs per newton
D) newtons per coulomb
28. If an electron is moved from point A to point C, the potential
energy of the electron will
A) decrease
C) remain the same
B) increase
29. If an electron moves from point A to point B, the electron's
electric potential energy will
A) decrease
C) remain the same
B) increase
Electrostatics Review
30. What is the total amount of work required to move a proton
through a potential difference of 100. volts?
A) 1.60 × 10–21 J
C) 1.00 × 102 J
B) 1.60 × 10 –17 J
D) 6.25 × 1020 J
33. The graph below shows the relationship between the work
done on a charged body in an electric field and the net charge
on the body.
31. If 1.0 joule of work is required to move 1.0 coulomb of charge
between two points in an electric field, the potential difference
between the two points is
A) 1.0 × 100 V
C) 6.3 × 1018 V
B) 9.0 × 109 V
D) 1.6 × 10–19 V
32. The diagram below shows proton P located at point A near a
positively charged sphere.
What does the slope of this graph represent?
B) potential difference
D) electric field intensity
A) power
C) force
If 6.4 ×10–19 joule of work is required to move the proton from
point A to point B, the potential difference between A and B is
6.4 × 10–19 V
A)
C) 6.4 V
4.0 × 10–19 V
B)
D) 4.0 V
34. The work required to move 2 coulombs of charge through a
potential difference of 5 volts is
A) 10 J
B) 2 J
C) 25 J
D) 50 J
Answer Key
Electrostatics Review
1.
A
2.
C
3.
C
4.
C
5.
C
6.
A
7.
D
8.
D
9.
B
10.
C
11.
D
12.
C
13.
B
14.
A
15.
D
16.
C
17.
D
18.
C
19.
B
20.
B
21.
C
22.
C
23.
B
24.
A
25.
D
26.
B
27.
B
28.
B
29.
C
30.
B
31.
A
32.
D
33.
B
34.
A