Download Electrostatics exam review

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1. An object possessing an excess of 6.0 × 106 electrons has a
net charge of
1. 2.7 × 10-26 C
2. 5.5 × 10-24 C
4. In the diagram, a positive test charge is located between two
charged spheres, A and B. Sphere A has a charge of +2q and is
located 0.2 meter from the test charge. Sphere B has a charge of
-2q and is located 0.1 meter from the test charge.
3. 3.8 × 10-13 C
4. 9.6 × 10-13 C
2. The diagram below shows the arrangement of three small
spheres, A, B, and C, having charges of 3q, q, and q,
respectively. Spheres A and C are located distance r from
sphere B.
If the magnitude of the force on the test charge due to sphere A
is F, what is the magnitude of the force on the test charge due
to sphere B?
1. 2. 2F
Compared to the magnitude of the electrostatic force exerted by
sphere B on sphere C, the magnitude of the electrostatic force
exerted by sphere A on sphere C is
1. the same
2. twice as great
3. as great
4. as great
3. 4. 4F
5. What is the smallest electric charge that can be put on an
object?
1. 9.11 × 10-31 C
2. 1.60 × 10-19 C
3. 9.00 × 109 C
4. 6.25 × 1018 C
3. A negatively charged object is brought near the knob of a
negatively charged electroscope. The leaves of the
electroscope will
1. move closer together
2. move farther apart
3. become positively charged
4. become neutral
6. A balloon is rubbed against a student’s hair and then
touched to a wall. The balloon "sticks" to the wall due to
1. electrostatic forces between the particles of the balloon
2. magnetic forces between the particles of the wall
3. electrostatic forces between the particles of the balloon
and the particles of the wall
4. magnetic forces between the particles of the balloon and
the particles of the wall
7. In order to produce a magnetic field, an electric charge must
be
1. stationary 3. positive
2. moving 4. negative
8. Two parallel metal plates are connected to a variable source
of potential difference. When the potential difference of the
source is increased, the magnitude of the electric field strength
between the plates increases. The diagram below shows an
electron located between the plates.
11. If the potential difference between two oppositely charged
metal plates is doubled, the electric field intensity at a point
between them is
1. halved
3. doubled
2. unchanged 4. quadrupled
12. What is the approximate electrostatic force between two
protons separated by a distance of 1.0 × 10-6 meter?
1. 2.3 × 10-16 N and repulsive
2. 2.3 × 10-16 N and attractive
Which graph represents the relationship between the
magnitude of the electrostatic force on the electron and the
magnitude of the electric field strength between the plates?
3. 9.0 × 1021 N and repulsive
4. 9.0 × 1021 N and attractive
13. The diagram below shows two identical metal spheres, A
and B, separated by distance d. Each sphere has mass m and
possesses charge q.
3. 1. 4. 2. Which diagram best represents the electrostatic force Fe and
the gravitational force Fg acting on sphere B due to sphere A?
1. 3. 2. 4. 9. Two metal spheres having charges of +4.0 × 10-6 coulomb
and +2.0 × 10-5 coulomb, respectively, are brought into contact
and then separated. After separation, the charge on each
sphere is
1. 8.0 × 10-11 C
2. 8.0 × 10-6 C
3. 2.1 × 10-6 C
4. 1.2 × 10-5 C
10. The electrostatic force between two positive point charges
is F when the charges are 0.1 meter apart. When these point
charges are placed 0.05 meter apart, the electrostatic force
between them is
1. 4F, and attracting
2. , and attracting
3. 4F, and repelling
4. , and repelling
14. As shown in the diagram, a neutral pith ball suspended on
a string is attracted to a positively charged rod.
During contact with the rod, the pith ball
1. loses electrons 3. loses protons
2. gains electrons 4. gains protons
15. Which graph best represents the relationship between
electric field intensity and the distance from a point charge?
1. 2. 3. 16. 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
1. decrease
2. increase
3. remain the same
17. A distance of 1.0 meter separates the centers of two small
charged spheres. The spheres exert gravitational force Fg and
electrostatic force Fe on each other. If the distance between the
spheres’ centers is increased to 3.0 meters, the gravitational
force and electrostatic force, respectively, may be represented
as:
1. and 2. and 4. 3. 3Fg and 3Fe
4. 9Fg and 9Fe
Figure 1
Base your answer to the question on the information and diagram below.
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.
18. [Refer to figure 1]
Which arrow best represents the direction of the resultant
electric field at point P due to the charges on spheres A and B?
1. 3. 20. If a positively charged rod is brought near the knob of a
positively charged electroscope, the leaves of the electroscope
will
1. converge, only
2. diverge, only
3. first diverge, then converge
4. first converge, then diverge
21. 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
2. 4. 1. 1.0 × 100 V
2. 9.0 × 109 V
3. 6.3 × 1018 V
4. 1.6 × 10-19 V
19. A positive test charge is placed between an electron, e, and
a proton, p, as shown in the diagram.
22. An electron is located in an electric field of magnitude 600.
newtons per coulomb. What is the magnitude of the
electrostatic force acting on the electron?
1. 3.75 × 1021 N
2. 6.00 × 102 N
3. 9.60 × 10−17 N
4. 2.67 × 10−22 N
When the test charge is released, it will move toward
1. A 3. C
2. B 4. D
23. Moving +2.0 coulombs of charge from infinity to point P in
an electric field requires 8.0 joules of work. What is the electric
field potential at point P?
1. 0.25 V 3. 16 V
2. 8.0 V 4. 4.0 V
24. Which quantity of excess electric charge could be found
on an object?
29. In the diagram below, point P is located in the electric field
between two oppositely charged parallel plates.
1. 6.25 × 10-19 C
2. 4.80 × 10-19 C
3. 6.25 elementary charges
4. 1.60 elementary charges
25. In an electric field, 0.90 joule of work is required to bring
0.45 coulomb of charge from point A to point B. What is the
electric potential difference between points A and B?
1. 5.0 V 3. 0.50 V
2. 2.0 V 4. 0.41 V
26. When a rod is brought near a neutral electroscope, the
leaves diverge. Which statement best describes the charge on
the rod?
1. It must be positive.
2. It must be negative.
3. It must be neutral.
4. It may be positive or negative.
27. A glass rod is given a positive charge by rubbing it with
silk. The rod has become positive by
1. gaining electrons 3. losing electrons
2. gaining protons 4. losing protons
Compared to the magnitude and direction of the electrostatic
force on an electron placed at point P, the electrostatic force on
a proton placed at point P has
1. 2. 3. 4. the same magnitude and the same direction
the same magnitude, but the opposite direction
a greater magnitude, but the same direction
a greater magnitude and the opposite direction
30. The diagram below represents the electric field surrounding
two charged spheres, A and B.
28. A sphere has a net excess charge of -4.8 × 10-19 coulomb. The sphere must have an excess of
1. 1 electron 3. 3 electrons
2. 1 proton 4. 3 protons
What is the sign of the charge of each sphere?
1. Sphere A is positive and sphere B is negative.
2. Sphere A is negative and sphere B is positive.
3. Both spheres are positive.
4. Both spheres are negative.