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WorksheetsElectrostatics
Total questions: 50
Worksheet time: 49mins
Two like charges
attract each other
repel each other
neutralize each other
must be neutrons
Coulomb's law says that the force between any two charges depends
directly on the size of the charges
inversely on the square of the distance between the charges
directly on the square of the distance between the charges
inversely on the size of the charges
When the distance between two charges is halved, the electrical force between the charges
quadruples
doubles
halves
reduces to one fourth
The SI unit of charge is the
Newton
Ohm
Coulomb
Joule
Conservation of charge means that
the total amount of charge in the universe is constant
charge can neither be created nor destroyed
electrons themselves can be neither created nor destroyed
no experimenter has ever seen charged destroyed by itself
Particle A has twice as much charge as particle B. Compared to the force on particle A, the force on particle B is
four times as much
two times as much
the same
half as much
If you comb your hair and the comb becomes positively charged, your hair becomes
positively charged
negatively charged
uncharged
A difference between electrical forces and gravitational forces is that electrical forces include
separation distance
repulsive interactions
the inverse square law
infinite range
In a good insulator, electrons are usually
free to move around
free to move around after an impurity has been added
tightly bound in place
not moving at all
Objects can be charged by
friction
conduction / contact
induction
all of these
To be safe in the unlikely case of a lightning strike, it is best to be inside a building framed with
steel
wood
either building will be just as safe or unsafe
When a charged cloud passes overhead, the ground below is charged by
induction
conduction
deduction
polarization
The reason a rubbed balloon will stick to a wall is that
the charge is slightly sticky and acts like glue
electrons transfer back and forth between the wall and the balloon
induced opposite charges in the wall are closer than the other wall charges
balloon material simply sticks to walls
The electrostatic force between two charges located 2 meters apart is 0.10 N. What will the force be between these charges when they are located 1 meter apart?
0.40 N
0.20 N
0.10 N
0.05 N
The direction of electric field lines show the
strength of the field
direction of the force on a positive test charge
size of the field
all of these
Suppose a hollow metal sphere has a large negative charge on it. The electric field strength inside the sphere is
large and positive
large and negative
weak and negative
weak and positive
zero
A small, positively charged object near a positively charged sphere is moved closer to the sphere. The electric potential energy of the small object
increases
decreases
stays the same
When an electron is brought near a negatively charged sphere, its potential energy increases. The reason this happens is that
negative charges repel each other
work was done to bring the charges together
two like charges go from a position far apart to a position close together
all of these
When two negative charges are held close together and then released, the charges will
accelerate toward each other
accelerate away from each other
move at a constant speed away from each other
not move
Electric potential is defined as
gravitational potential energy per charge
electric potential energy of a charge
electric potential energy of a charge divided by the quantity of charge
electric potential energy of a charge multiplied by the quantity of charge
Two parallel plates are oppositely charged. The left plate is negative and the right plate is positive. In which direction does the electric field point?
to the right
to the left
The electric field lines between two oppositely charged parallel metal plates will be
straight lines, randomly spaced
straight lines, evenly spaced
curved lines, randomly spaced
curved lines, evenly spaced
Which of the following are vector quantities?
electric force
electric potential
electric field
electric potential energy
Which of the following best characterizes electrical conductors?
low mass density
high tensile strength
electric charges move freely
poor heat conductors
Two point charges are 6 cm apart. They are moved to a new separation of 2 cm. By what factor does the resulting mutual force between them change?
1/3
3
1/9
9
An electron is sent at high speed toward a gold nucleus (charge +79e). What is the electrical force acting on the electron when when it is 3.4x10-14 m away from the gold nucleus?
16 N
1.57 N
1.6x10-4 N
1x10-6 N
A 6.2 𝜇C charge is placed at the origin and a second charge is placed on the x-axis at x=0.1 m. If the resulting force on the second charge is 5.2 N in the positive x-direction, what is the value of its charge?
0.9 𝜇C
0.9 nC
-0.9 𝜇C
-0.9 nC
Two point charges are separated by 12.0 cm and have charges of +5.00 𝜇C and -5.00 𝜇C, respectively. What is the electric field at a point midway between the two charges?
3.75x106 N/C
2.5x107 N/C
1.75x106 N/C
2.13x108 N/C
An electron is moving in the presence of an electric field of 400 N/C. What force does the electron experience?
6.4x10-22 N
8x10-21 N
6.4x10-17 N
1.6x10-17 N
A proton initially moves left to right long the x axis at a speed of 9.00 × 103 m/s. It moves into an electric field, which points in the negative x direction, and travels a distance of 0.900 m before coming to rest. What magnitude of acceleration does the proton experience?
9×103 m/s2
4.5×107 m/s2
2.25×109 m/s2
18×1011 m/s2
Two charges, +Q and −Q, are located two meters apart and there is a point along the line that is equidistant from the two charges as indicated. Which vector best represents the direction of the electric field at that point?
vector EA
vector EB
vector Ec
the electric field at that point is zero
A proton moves 20 cm along the direction of an electric field of strength 2.5 N/C. The electrical potential difference between the proton’s initial and ending points is:
5x10-19 V
0.5 V
26.25 V
1 V
An 8.0-V battery is connected between two parallel metal plates 5 mm apart. What is the magnitude of the electric field between the plates?
1600 N/C
16 N/C
13 N/C
6.25x10-6 N/C
The unit of electrical potential, the volt, is dimensionally equivalent to:
J*C
J/C
C/J
F*C
A free electron is in an electric field. With respect to the field, it experiences a force acting:
parallel
anti-parallel (opposite in direction)
perpendicular
along a constant potential line
In which case does an electric field do positive work on a charged particle?
A negative charge moves opposite to the direction of the electric field.
A positive charge is moved to a point of higher potential energy.
A positive charge completes one circular path around a stationary positive charge.
A positive charge completes one elliptical path around a stationary positive charge.
If the distance between two isolated parallel plates that are oppositely charged is doubled, the electric field between the plates is essentially unchanged. However, the:
potential difference between the plates will double.
charge on each plate will double.
force on a charged particle halfway between the plates will get twice as small.
force on a charged particle halfway between the plates will get four times as small.
If the distance between two negative point charges is increased by a factor of three, the resultant potential energy is what factor times the initial potential energy?
3.0
9.0
1/3
1/9
Two point charges of values +3.4 and +7.0 μC are separated by 0.3 m. What is the electrical potential at the point midway between the two point charges?
+0.6 × 106 V
+0.3 × 106 V
+0.1 × 106 V
+1.0 × 106 V
At what distance from a point charge of 7.3 μC would the electrical potential be 4.9 × 104 V?
1.64 m
0.4 m
1.34 m
0.67 m
Two point charges of values +3.3 and +5.1 μC, respectively, are separated by 0.65 m. What is the potential energy of this 2-charge system?
+0.5 J
+0.1 J
+0.2 J
+0.8 J
An ion is released from rest and moves due to the force from an electric field from a position in the field having a potential of 14 V to a position having a potential of 8 V. The ion:
must have a positive charge
must have a negative charge
can have either a positive or negative charge
must be neutral
A parallel-plate capacitor has a capacitance of 24 μF. What potential difference across the plates is required to store 6.8 × 10−4 C on this capacitor?
28.3 V
28.3x10-2 V
39.2x10-8 V
32.6 V
What is the equivalent capacitance of the combination shown?
24 𝜇F
100 𝜇F
12 𝜇F
4.6 𝜇F
If C = 14 μF, what is the equivalent capacitance for the combination shown?
28 μF
17 μF
0.29 μF
7 μF
The unit for electric force
Newton (N)
Coulomb (C)
Newtons/Coulomb (N/C)
Farad (F)
The units for electric field strength
Newtons/Coulomb (N/C)
Volts/meter (V/m)
Joules/Coulomb (J/C)
Joules/meter (J/m)
The unit for electric potential
volts (J/C)
Farad (F)
Coulomb (C)
Newton-meters (N-m)
The unit for electrical potential energy
Joules (J)
Coulombs (C)
Farads (F)
Newtons (N)
The unit for capacitance
Farad (F)
Coulomb (C)
Volts (V)
Joules (J)
