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WorksheetsLực Tương Tác Giữa Hai Điện Tích
Total questions: 115
Worksheet time: 3600secs
What is a point charge?
An object with very small size.
A charge considered to be concentrated at a point.
An object containing very little charge.
A point that emits charge.
Which statement is correct regarding electric interaction?
Like charges repel each other.
Like charges attract each other.
Opposite charges repel each other.
Two similar plastic rods, after being rubbed with wool, will attract each other when brought close.
The unit of electric charge is:
N.
m.
C.
N.m.
Two opposite charges will:
Attract each other.
Repel each other.
Not interact with each other.
Both attract and repel each other.
Two like charges will:
Attract each other.
Repel each other.
Not interact with each other.
Both attract and repel each other.
The dielectric constant of air can be considered as:
ε = 0.
ε < 0.
ε > 0.
ε ≈ 1.
The expression for the force of interaction between two charges in a vacuum is:
F =
F =
F =
F =
Which statement is false?
A point charge is a charge considered to be concentrated at a point.
There are two types of charges: positive and negative.
Like charges repel each other, opposite charges attract each other.
When attracting, charges will move closer together.
Which of the following statements about dielectrics is correct?
A dielectric is a conductive medium. The dielectric constant of a vacuum is 1.
A dielectric is an insulating medium. The dielectric constant of a vacuum is 1.
The dielectric constant of a medium indicates how much greater the interaction force between charges in that medium is compared to when they are in a vacuum.
The dielectric constant can be less than 1.
The magnitude of the force of interaction between two point charges in air:
Is proportional to the square of the distance between the two charges.
Is proportional to the distance between the two charges.
Is inversely proportional to the distance between the two charges.
Is inversely proportional to the square of the distance between the two charges.
Two charges q1 and q2 repel each other. Which conclusion is correct?
q1 and q2 are both positive or both negative.
q1 is negative and q2 is positive.
q1 is positive and q2 is negative.
q1.q2 = 0.
There are two point charges q1 and q2, they attract each other. Which statement is incorrect?
q1 > 0 and q2 > 0.
q1.q2 < 0.
If q1 is negative then q2 is positive.
The interaction force between two charges in a vacuum is: F =
The magnitude of the interaction force between two stationary point charges in a homogeneous dielectric does not depend on which of the following factors?
The magnitude of the charges.
The sign of the charges.
The nature of the dielectric.
The distance between the two charges.
When the distance between two point charges in a vacuum is reduced by 4 times, the magnitude of the Coulomb force:
Increases by 4 times.
Decreases by 4 times.
Decreases by 8 times.
Increases by 16 times.
To increase the interaction force between two point charges by 9 times, what should be done?
If the electric field strength decreases by 4 times, what happens to the Coulomb force?
increases 4 times
decreases 4 times
decreases 8 times
increases 16 times
To increase the interaction force between two point charges by 9 times, how must the distance between them change?
increase 2 times
increase 3 times
decrease 3 times
decrease 2 times
When the distance between two point charges increases by 2 times and each charge increases by 2 times, what happens to the electric force between them?
increases 2 times
decreases 2 times
increases 4 times
remains unchanged
In which case can Coulomb's law be applied to calculate the interaction force?
interaction between two charged glass rods placed close to each other
interaction between two small charged spheres placed far apart
electric interaction between a glass rod and a large sphere
interaction between a glass rod and a charged plastic rod placed close to each other
Which of the following interactions can Coulomb's law be applied to?
Two point charges fixed at two positions in a medium
Two point charges fixed close to each other, one in oil and one in water
Two point charges moving freely in the same medium
Two point charges oscillating around two fixed positions in a medium
What is an electric field?
the air surrounding a charge
the medium containing charges
the environment surrounding a charge that exerts electric force on other charges placed within it
the conductive medium
The intensity of the electric field at a point characterizes what?
the volume of the region with an electric field being large or small
the electric field at that point in terms of energy storage
the force exerted by the electric field on a charge at that point
the speed of charge movement at that point
The vector of electric field intensity at each point has a direction that is:
the same as the electric force acting on a positive test charge at that point
the same as the electric force acting on a test charge at that point
dependent on the magnitude of the test charge
dependent on the temperature of the medium
Among the following units, which one is the unit of electric field intensity?
V
V.m
V/m
N
What is the expression for calculating the electric field intensity caused by a point charge Q?
E =
E =
E =
E =
Electric field is:
A form of matter surrounding charges and transmitting electric interactions
A form of matter surrounding charges and transmitting magnetic interactions
A form of matter surrounding materials and transmitting electric interactions
A form of matter surrounding materials and transmitting magnetic interactions
Electric field intensity is a quantity that is:
scalar, with a positive value
scalar, with a positive or negative value
vector, direction coinciding with the direction of the electric force acting on a positive charge
vector, always directed towards the charge
For a point charge -Q, the electric field at a point it creates has a direction that is:
away from it
towards it
dependent on its magnitude
dependent on the surrounding dielectric
What is the direction of the electric field caused by a point charge +Q?
Towards it.
Away from it.
Depends on its magnitude.
Depends on the surrounding dielectric.
What is the magnitude of the electric field at a point caused by a point charge not dependent on?
The magnitude of the test charge.
The magnitude of that charge.
The distance from the point being considered to that charge.
The dielectric constant of the medium.
What is the manifestation of the electric field?
Gravitational force
Magnetic force
Electric force
Inertial force
If the distance from the source charge to the point being considered increases by 3 times, what happens to the electric field strength?
Decreases by 3 times.
Increases by 3 times.
Decreases by 9 times.
Increases by 9 times.
Which of the following is a characteristic of a uniform electric field?
The electric field strength has the same direction at all points.
The electric field strength has the same magnitude at all points.
The electric field strength decreases over time.
The electric field lines are parallel and equidistant.
Which statement is correct?
Electric field lines indicate the distribution of field lines in the electric field.
All field lines originate from positive charges and end at negative charges.
Electric field lines always originate from positive charges.
The electric field lines are straight and parallel and not equidistant.
Choose the most correct option? A uniform electric field is an electric field where:
The magnitude of the electric field at all points is the same.
The vector of electric field strength at all points is equal.
The direction of the electric field vector is constant.
The magnitude of the electric field acting on the test charge is constant.
Let a positive ion move without initial velocity from any point in an electric field caused by two positive point charges. The ion will move:
Along an electric field line.
Along a line connecting the two point charges.
From a point of high potential to a point of low potential.
From a point of low potential to a point of high potential.
The expression for the work done by the electric force in a uniform electric field is:
A = qE.
A = qEd.
A = qd.
A = Fd.
The work done by the electric force in moving charge q in the electric field from point M to point N does not depend on which factor?
Charge q.
Magnitude of the electric field strength.
Position of points M and N.
Shape of the path from point M to point N.
The work done by the electric force does not depend on:
The strength of the electric field.
The shape of the path.
The magnitude of the displaced charge.
The initial and final points of the path.
The potential energy of a charge in an electric field characterizes:
The ability to exert force of the electric field.
The ability to do work of the electric field.
The direction of the electric field strength.
The magnitude of the region with an electric field.
When a charge moves along a field line in a uniform electric field, if the force acting on the charge remains constant and the distance moved increases by 4 times, what happens to the work done by the electric force?
increases 4 times
increases 2 times
remains unchanged
decreases 2 times
When a charge moves along a field line in a uniform electric field, if the force acting on the charge remains constant and the distance moved decreases by 2 times, what happens to the work done by the electric force?
increases 4 times
increases 2 times
remains unchanged
decreases 2 times
The expression for the work done by the electric force in a uniform electric field is:
A = qE
A = qEd
A = qd
A = Fd
The work done by the electric force does not depend on:
the intensity of the electric field
the shape of the path
the magnitude of the charge being moved
the position of the starting and ending points of the path
Which of the following statements is incorrect?
The work done by the electric force is equal to the decrease in potential energy of the charge in the electric field.
The expression for the work done by the electric force in a uniform electric field is: A = Ed.
A static electric field is a potential field.
The work done by the electric force on a charge does not depend on the path taken by the charge but only on the position of the starting and ending points of the path in the electric field.
The electric field force is:
Potential force
Gravitational force
Elastic force
Frictional force
The formula for determining the work done by the electric field force moving charge q in a uniform electric field E is A = qEd, where d is:
the distance between the starting and ending points.
the distance between the projections of the starting and ending points onto a field line.
the algebraic length of the segment from the projection of the starting point to the projection of the ending point along a field line.
the algebraic length of the segment from the projection of the starting point to the projection of the ending point along a field line measured in the direction of the electric field.
The potential energy of a charge in an electric field is characterized by:
the ability to exert force by the electric field.
the ability to do work by the electric field.
the direction of the electric field intensity.
the magnitude of the region of space with an electric field.
Find the incorrect statement:
The potential energy of charge q placed at point M in the electric field is WM = q.VM.
The work done by the electric force is equal to the decrease in potential energy of the charge in the electric field.
The potential energy of charge q placed at point M in the electric field does not depend on the charge q.
The potential energy of charge q placed at point M in the electric field is characterized by the ability to do work by the electric field at that point.
When the charge moves along a field line in a uniform electric field, if the force acting on the charge remains the same and the displacement decreases by 2 times, what happens to the work done by the electric field?
increases 4 times
increases 2 times
remains unchanged
decreases 2 times
When the charge moves along a field line in a uniform electric field, if the force acting on the charge remains the same and the displacement increases by 3 times, what happens to the work done by the electric field?
increases 2 times
increases 3 times
remains unchanged
decreases 3 times
When the charge moves along a field line in a uniform electric field, if the force acting on the charge remains the same and the displacement decreases by 3 times, what happens to the work done by the electric field?
increases 3 times
increases 2 times
remains unchanged
decreases 3 times
If the charge moves in the electric field such that its potential energy increases, what happens to the work done by the electric field?
negative
positive
zero
not enough information to determine
The electric potential is a quantity that characterizes the electric field in terms of
the ability to create potential energy when placing a charge q at that point
the ability to do work in a space with an electric field
the ability to do work at a point
the ability to exert force at all points in a space with an electric field
The electric potential is a quantity that is:
an algebraic quantity
a vector quantity
always positive
always negative
The electric potential at a point M in the electric field is determined by the expression:
VM = q.AM∞
VM = AM∞
The unit of electric potential difference is:
V/m
V
C
J
Which of the following expressions is incorrect?
UMN = VM - VN
U = E.d
A = qEd
UMN = AMN.q
The electric potential difference between two points:
characterizes the ability to do work of the electric field of a stationary charge q
characterizes the ability to exert force of the electric field of a stationary charge q
characterizes the ability to create force of the electric field in the movement of charge q from one point to another
characterizes the ability to do work of the electric field in the movement of charge q from one point to another
The unit of electric potential is the volt (V). 1V equals
1 J.C
1 J/C
1 N/C
1 J/N
The quantity that characterizes the ability to perform work of the electric field when a charge moves between two points is called:
work of the electric force
electric potential
potential difference
electric field strength
Among the following statements about electric potential difference, the incorrect statement is:
The unit of electric potential difference is V
The electric potential difference between two points depends on the position of those two points
The electric potential difference between two points depends on the charge moving between those two points
The electric potential difference characterizes the ability to do work when moving a charge between two points in the electric field
The relationship between electric potential difference and electric field strength is:
U = qd
U = q.E.d
U = E.q
U = E.d
A capacitor is
a system of two conductors placed far apart
a system of two objects placed close together and separated by an insulating layer
a system of two conductors placed close together and separated by an insulating layer
a system
What is the method of charging a capacitor?
Place the capacitor near a power source.
Rub the capacitor plates against each other.
Place the capacitor near a charged object.
Connect the two plates of the capacitor to the terminals of a power source.
Which of the following statements about capacitors is correct?
The capacitance of a capacitor characterizes its ability to store charge.
The capacitance of a capacitor characterizes its ability to store charge, the unit of capacitance is N.
Under a certain voltage, a capacitor with small capacitance can store a large charge.
The higher the voltage, the larger the capacitance of the capacitor.
The capacitance of a capacitor is determined by the expression:
C = QU
C =
C = UQ
C = 2QU
The unit of capacitance is:
N.
C.
F.
V.
Fara is the capacitance of a capacitor that
between the two plates of the capacitor has a voltage of 1V, it can store a charge of 1 C.
between the two plates of the capacitor has a constant voltage, it is charged with 1 C.
between the two plates of the capacitor has a dielectric with a dielectric constant of 1.
the distance between the two plates of the capacitor is 1 mm.
1pF is equal to
10-9 F.
10-12 F.
10-6 F.
10-3 F.
What do the data on the capacitor's label indicate?
The minimum value of capacitance and the voltage applied to the two terminals of the capacitor.
Distinguish the names of different types of capacitors.
The capacitance of the capacitor and the limits of the voltage applied to the two terminals of the capacitor.
The energy of the electric field in the capacitor.
Find the false statement
A capacitor is used to store charge.
A capacitor is only used to store charge in a circuit.
A capacitor is a system of two conductors placed close together and separated by an insulating layer.
The capacitance of a capacitor characterizes its ability to store charge at a certain voltage.
In which of the following cases do we have a capacitor?
Two zinc plates immersed in acid solution.
Two tin plates immersed in NaOH solution.
Two dry wooden plates placed apart in the air.
Two aluminum plates placed apart in pure water.
The unit of electric current, electromotive force, and electric charge are respectively
volt (V), ampere (A), ampere (A).
ampere (A), volt (V), coulomb (C).
newton (N), farad (F), volt (V).
farad (F), volt/meter (V/m), joule (J).
Electric current in metals is
the flow of electric charge.
the directed flow of free electric charges.
the directed flow of charged particles.
the directed flow of positive and negative ions.
The convention for the direction of electric current is
the direction of flow of electrons.
the direction of flow of ions.
the direction of flow of negative ions.
the direction of flow of positive charges.
A constant current is
a current whose direction does not change over time.
a current whose intensity changes over time.
What is a constant current?
A current that does not change direction over time.
A current that changes intensity over time.
A current that has the amount of charge passing through a cross-section of the wire changing over time.
A current that has both direction and intensity unchanged over time.
What is the unit of current intensity?
Ampere.
Coulomb.
Volt.
Joule.
In metallic conductors, current is the flow of which particles?
Positive charge carriers.
Protons.
Free electrons.
Negative charge carriers.
Choose the correct statement.
Current intensity indicates the strength or weakness of the current.
When temperature increases, current intensity increases.
Current intensity through a circuit segment is inversely proportional to the charge moving through that segment.
Current is the flow of electrons moving in a specific direction.
The units of electromotive force and charge are respectively?
Ampere (A), Ampere (A).
Volt (V), Coulomb (C).
Farad (F), Volt (V).
Volt/meter (V/m), Joule (J).
The conventional direction of current is the direction of movement of?
Electrons.
Neutrons.
Positive charge carriers.
Negative charge carriers.
Which of the following statements is false?
In metallic conductors, the direction of current is opposite to the movement of free electrons.
The direction of current in metals is the direction of movement of positive ions.
The conventional direction of current is the direction of movement of positive charges.
Current is the flow of charged particles moving in a specific direction.
When superconductivity occurs, what happens to the resistivity of metals?
The resistivity of metals decreases.
The resistivity of metals increases.
The resistivity remains unchanged.
The resistivity increases and then decreases.
Which of the following indicates a good electrical conductor?
The distance between the network ions in the metal is very large.
The density of free electrons in the metal is very high.
The density of free ions is high.
The charge value contained in each free electron of the metal is greater than in other substances.
The thermal resistivity coefficient α of metals depends on which of the following factors?
Temperature range and processing mode of that material.
Purity of the metal and processing mode of that material.
Purity of the metal.
Temperature range, purity of the metal, and processing mode of that material.
The V-I characteristic curve represents the dependence of current intensity through a resistor on the voltage across the conductor is a curve that is?
Elliptical.
Straight.
Hyperbolic.
Parabolic.
The resistivity of metals depends on which of the following factors?
The temperature of the metal.
The size of the metallic conductor.
The nature of the metal.
The temperature and nature of the metallic conductor.
In addition to the unit ampere (A), the unit of current intensity can be?
Coulomb (C).
Volt (V).
Coulomb per second (C/s).
Joule (J).
A variable resistor is?
A resistor that can change its value and is used to adjust the direction of current in the circuit.
A resistor that can change its value and is used to adjust the intensity.
What is a variable resistor?
A resistor that can change its value and is used to adjust the direction of current in a circuit.
A resistor that can change its value and is used to adjust the intensity and direction of current in a circuit.
A resistor that can change its value and is used to adjust the intensity of current in a circuit.
A resistor that cannot change its value and is used to adjust the intensity of current.
Choose the correct statement about Ohm's law.
The current flowing through a conductor is proportional to the voltage across the two ends of the conductor and the resistance of the wire.
The current flowing through a conductor is directly proportional to the voltage across the two ends of the conductor and not proportional to the resistance of the wire.
The current flowing through a conductor is directly proportional to the voltage across the two ends of the conductor and inversely proportional to the resistance of the wire.
The current flowing through a conductor is inversely proportional to the voltage across the two ends of the conductor and directly proportional to the resistance of the wire.
When the voltage across the two ends of a conductor increases, what happens?
The current flowing through the conductor remains unchanged.
The current flowing through the conductor decreases, proportional to the voltage.
The current flowing through the conductor sometimes increases and sometimes decreases.
The current flowing through the conductor increases, proportional to the voltage.
The graph representing the dependence of current on voltage across the two ends of a conductor has the form of:
A straight line passing through the origin.
A curve passing through the origin.
A straight line not passing through the origin.
A curve not passing through the origin.
Electric current is defined as:
The directed flow of electric charges.
The movement of electric charges.
The directed flow of electrons.
The directed flow of positive ions.
The work of the power source is the work of:
The external force in the source.
The electric field force moving charges in the external circuit.
The mechanical force that the current can generate.
The force moving the power source from one position to another.
Among the following statements, which one is incorrect about electric current?
The unit of electric current is A.
The electric current is measured by an ammeter.
The larger the electric current, the more charge passes through the cross-section of the conductor in a unit of time.
A constant current is one that has a direction that does not change over time.
The condition to have electric current is:
There is voltage.
There are free charges.
There is voltage and free charges.
There is a power source.
The power source creates a voltage between its two terminals by:
Separating electrons from atoms and transferring electrons and ions to the terminals of the source.
Generating electrons at the negative terminal.
Generating positive ions at the positive terminal.
Making electrons disappear at the positive terminal.
Electric current has no effect in the following actions:
Mechanical effect.
Thermal effect.
Chemical effect.
Magnetic effect.
In the power source, the external force has the effect of:
Moving positive charges from the positive terminal of the power source to the negative terminal.
Moving positive charges from the negative terminal of the power source to the positive terminal.
Which statement is incorrect?
When the battery discharges, there is a conversion of chemical energy to electrical energy.
When the accumulator discharges, there is a conversion of chemical energy to electrical energy.
When charging the accumulator, there is only a conversion of electrical energy to chemical energy.
When charging the accumulator, there is a conversion of electrical energy to chemical energy and thermal energy.
What is the expression for the voltage across the external circuit?
UN = Ir.
UN = I(RN + r).
UN = E - I.r.
UN = E + I.r.
When a short circuit occurs, the current in the circuit
increases significantly.
increases and decreases continuously.
decreases to 0.
remains unchanged compared to before.
The electrical energy consumed by a circuit segment is not proportional to
the voltage across the circuit.
the temperature of the conductor in the circuit.
the current in the circuit.
the time the current flows through the circuit.
For a circuit with a constant voltage, if the internal resistance is adjusted to double, then in the same time period, the energy consumed by the circuit
decreases by half.
decreases by 4 times.
increases by 2 times.
remains unchanged.
For a circuit with a constant resistance, if the voltage across the circuit doubles, then in the same time period, the energy consumed by the circuit
increases by 4 times.
increases by 2 times.
remains unchanged.
decreases by half.
Among the following statements about the electrical power of a circuit segment, the incorrect statement is:
Power is proportional to the voltage across the circuit.
Power is proportional to the current flowing through the circuit.
Power is inversely proportional to the time the current flows through the circuit.
Power is measured in watts (W).
If the voltage across a segment of the circuit is constant, and the resistance of the circuit is halved, then the electrical power of the circuit
increases by 4 times.
remains unchanged.
decreases by 4 times.
increases by 2 times.
In a circuit with only pure resistance, with the same time, if the current decreases by half, then the heat generated in the circuit
decreases by half.
decreases by 4 times.
increases by 2 times.
increases by 4 times.
In a circuit with constant pure resistance, if we want to increase the thermal power by 4 times, we must
double the voltage.
quadruple the voltage.
reduce the voltage by half.
reduce the voltage by 4 times.
The work done by the power source is determined by the formula:
A = EIt.
A = UIt.
A = EI.
A = UI.
The work done by the electric current is measured in:
J/s
kWh
W
kVA
The electrical power is determined by the formula:
P = EIt.
P = UIt.
P = EI.
P = UI.
