Electrostatics Review

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Electrostatics Review

• LCHS
• Dr.E

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Which is a vector quantity? (A) speed (B)
work (C) mass (D) displacement
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Which object has the greatest inertia? (A) a
5.00-kg mass moving at 10.0 m/s (B) a 10.0-kg
mass moving at 1.00 m/s (C) a 15.0-kg mass moving
at 10.0 m/s (D) a 20.0-kg mass moving at 1.00 m/s
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A positive test charge is placed between an
electron, e, and a proton, p, as shown in the
diagram below.
When the test charge is released, it will move
toward (A) A (B) B (C) C (D) D
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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? (A) 5.0 V (B) 2.0 V (C) 0.50 V (D)
0.41 V
6
In the diagram above, proton p, neutron n, and
electron e are located as shown between two
oppositely charged plates. The magnitude of
acceleration will be greatest for the (A)
neutron, because it has the greatest mass (B)
neutron, because it is neutral (C) electron,
because it has the smallest mass (D) proton,
because it is farthest from negative plate
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Two protons are located one meter apart. Compared
to the gravitational force of attraction between
the two protons, the electrostatic force between
the protons is (A) stronger and repulsive (B)
weaker and repulsive (C) stronger and
attractive (D) weaker and attractive
8
A balloon is rubbed against a students hair and
then touched to a wall. The balloon sticks to
the wall due to (A) electrostatic forces between
the particles of the balloon (B) magnetic
forces between the particles of the
wall (C) electrostatic forces between the
particles of the balloon and the particles
of the wall (D) magnetic forces between the
particles of the balloon and the particles
of the wall
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Two positively charged masses are separated
by a distance, r. Which statement best describes
the gravitational and electrostatic forces
between the two masses? (A) Both forces are
attractive. (B) Both forces are repulsive. (C)
The gravitational force is repulsive and the
electrostatic force is attractive. (D) The
gravitational force is attractive and the
electrostatic force is repulsive.
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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 (A) Fg and
Fe (B) 3Fg and 3Fe 9 9 (C)
Fg and Fe (D) 9Fg and 9Fe 3 3
11
A beam of electrons is directed into the electric
field between two oppositely charged parallel
plates. The electrostatic force exerted on the
electrons by the electric field is directed (A)
into the screen (B) out of the screen (C)
toward the bottom of the screen (D) toward the
top of the screen
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The particles in a nucleus primarily by the are
held together (A) magnetic force (B)
gravitational force (C) electrostatic force (D)
strong force
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A charge of 30 coulombs passes through a 24-ohm
resistor in 6.0 seconds. What is the current
through the resistor? (A) 1.3 A (B) 5.0
A (C) 7.5 A (D) 4.0 A
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The diagram represents the electric field
surrounding two charged spheres, A and B. What
is the sign of the charge of each sphere? (A)
Sphere A is positive and sphere B is
negative. (B) Sphere A is negative and sphere B
is positive. (C) Both spheres are
positive. (D) Both spheres are negative.
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The centers of two small charged particles are
separated by a distance of 1.2 104 meter. The
charges on the particles are 8.0 1019 Coulomb
and 4.8 1019 Coulomb, respectively.
Calculate the magnitude of the electrostatic
force between these two particles.
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A potential difference of 10.0 volts exists
between two points, A and B, within an electric
field. What is the magnitude of charge that
requires 2.0 102 joule of work to move it from
A to B? (A) 5.0102 C (B) 2.0101 C (C)
5.0102 C (D) 2.0103 C
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Two small identical metal spheres, A and B, on
insulated stands, are each given a charge of 2.0
106 Coulomb. The distance between the spheres
is 2.0 101 meter. Calculate the magnitude of
the electrostatic force that the charge on sphere
A exerts on the charge on sphere B.
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The diagram below represents an electron within
an electric field between two parallel plates
that are charged with a potential difference of
40.0 volts. If the magnitude of the electric
force on the electron is 2.00 1015 newton, the
magnitude of the electric field strength between
the charged plates is (A) 3.20 1034 N/C (B)
2.00 1014 N/C (C) 1.25 104 N/C (D) 2.00
1016 N/C
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Two small metallic spheres, A and B, are
separated by a distance of 4.0 101 meter, as
shown. The charge on each sphere is 1.0 106
coulomb. Point P is located near the spheres.
What is the magnitude of the electrostatic force
between the two charged spheres? (A) 2.2102 N
(B) 5.6x102 N (C) 2.2104 N (D) 5.6104 N
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An electroscope is a device with a metal knob, a
metal stem, and freely hanging metal leaves used
to detect charges. The diagram 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 (B)
increase (C) remain the same
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Compared to insulators, metals are better
conductors of electricity because metals contain
more free (A) protons (B) positive ions (C)
electrons (D) negative ions
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Electrostatic force F exists between two point
charges. If the distance between the charges is
tripled, the force between the charges will be
(A) F/9 (B) 3F (C) F/3 (D) 9F
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How much work is done in moving 5.0 coulombs of
charge against a potential difference of 12
volts? (A) 2.4 J (B) 30. J (C) 12 J (D) 60. J
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How much work is required to move a single
electron through a potential difference of 100.
volts? (1) 1.6 1021 J (3) 1.6 1017 J
(2) 1.6 1019 J (4) 1.0 102 J
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Metal sphere A has a charge of 12 elementary
charges and identical sphere B has a charge of
16 elementary charges. After the two spheres are
brought into contact, the charge on sphere A is
(A) 2 elementary charges (B) 2 elementary
charges (C) 14 elementary charges (D) 28
elementary charges
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What is the approximate electrostatic force
between two protons separated by a distance of
1.0 106 meter? (1) 2.3 1016 N and
repulsive (2) 2.3 1016 N and attractive (3)
9.0 1021 N and repulsive (4) 9.0 1021 N and
attractive