AP Physics 2: Algebra-Based Practice Quiz: Magnetic Fields
Written by AP Content Team, Verified for 2026 AP Exams, Last updated: May 2026
Test your understanding with short quizzes. This quiz has 16 questions to check your progress.
Question 1 of 16
All Questions (16)
A) A scalar field that determines the energy of static charges.
B) A vector field that determines the magnetic force on moving charges or currents.
C) A field created exclusively by permanent magnets with isolated poles.
D) A region where magnetic field lines begin and end on magnetic monopoles.
Correct Answer: B
The text explicitly states that a magnetic field is a 'vector field that can be used to determine the magnetic force exerted on moving electric charges, electric currents, or magnetic materials.' Options A, C, and D contradict the provided information about vector nature, isolated poles, and field lines.
A) originate from a north pole and terminate on a south pole.
B) form closed loops.
C) are always parallel to the direction of electric current.
D) only exist within magnetic materials.
Correct Answer: B
The content directly states, 'Magnetic field lines form closed loops.' This is a fundamental property distinguishing them from electrostatic field lines, which start and end on charges.
A) The number of free electrons in the material.
B) The material's electrical conductivity.
C) The configuration of magnetic dipoles within the material.
D) The constant value of vacuum permeability, μ₀.
Correct Answer: C
The text specifies that the magnetic behavior of a material is a result of 'the configuration of magnetic dipoles in the material.' The alignment or randomness of these dipoles determines the material's overall magnetic properties.
A) Magnetic fields can only be created by electric currents.
B) All magnets, if broken, will form smaller magnets each with a north and a south pole.
C) Magnetic forces are always weaker than electric forces.
D) A magnetic field is a scalar quantity.
Correct Answer: B
The statement that no magnetic north pole is found in isolation implies the non-existence of magnetic monopoles. Therefore, if a magnet is broken, new poles must form at the break to ensure every piece has both a north and a south pole. This is a classic illustration of the principle.
A) Only if the charge is stationary.
B) Only if the charge is moving.
C) Whether the charge is stationary or moving.
D) Only if the charge is part of a magnetic material.
Correct Answer: B
The provided content explicitly states that a magnetic field exerts a force on 'moving electric charges'. It does not mention a force on stationary charges.
A) the force exerted by a magnetic field on a moving charge.
B) a property of a material related to its magnetic behavior.
C) the density of magnetic field lines in a region.
D) the isolated strength of a magnetic north pole.
Correct Answer: B
The content introduces magnetic permeability as a property of a material. It is a measure of how a material responds to and modifies an external magnetic field, which is a key aspect of its magnetic behavior.
A) It represents the maximum possible magnetic permeability of any material.
B) It is the magnetic permeability of free space, also known as a vacuum.
C) It is a variable that depends on the strength of the electric current.
D) It describes the configuration of magnetic dipoles in a material.
Correct Answer: B
The text defines μ₀ as 'the vacuum permeability,' which is the 'constant value of magnetic permeability' for 'free space.'
A) A magnetic field has both magnitude and direction at every point in space.
B) The way a material behaves magnetically depends on its internal dipole structure.
C) Magnetic field lines can begin on a north pole and end in empty space.
D) A magnetic field can exert a force on a wire carrying an electric current.
Correct Answer: C
The content states that 'Magnetic field lines form closed loops.' This means they do not begin or end anywhere, including in empty space. Option A is true because it's a vector field. Option B is true based on the description of dipoles. Option D is true because an electric current is a form of moving electric charges.
A) The existence of the vacuum permeability constant, μ₀.
B) The fact that the magnetic field is a vector field.
C) The absence of isolated magnetic north or south poles.
D) The force exerted by the field on magnetic materials.
Correct Answer: C
If magnetic monopoles (isolated north or south poles) existed, magnetic field lines could start on a north pole and end on a south pole, just as electric field lines start and end on charges. The fact that field lines form closed loops is a direct consequence of there being no 'source' or 'sink' for the lines, which is equivalent to saying there are no isolated poles.
A) magnitude and direction.
B) mass and velocity.
C) charge and current.
D) permeability and dipole moment.
Correct Answer: A
By definition, a vector quantity has both a magnitude (strength) and a direction. The text identifies the magnetic field as a vector field, so this property applies.
A) Inside a highly magnetic iron core.
B) In a region of empty space.
C) Within a material with randomly oriented magnetic dipoles.
D) In any material where an electric current is present.
Correct Answer: B
The text explicitly states that μ₀ is the 'vacuum permeability' and is the constant value for 'free space.' Therefore, it is used for calculations in a vacuum or empty space.
A) A magnetic field is a vector field.
B) Magnetic field lines form closed loops.
C) Magnetic permeability is a property of materials.
D) A magnetic field exerts a force on moving charges.
Correct Answer: B
The claim of an isolated south pole (a magnetic monopole) contradicts the principle that 'No magnetic north pole is ever found in isolation from a south pole.' This principle is physically represented by the fact that 'Magnetic field lines form closed loops,' as isolated poles would require field lines to terminate on them.
A) vacuum permeability.
B) vector field nature.
C) configuration of magnetic dipoles.
D) interaction with stationary charges.
Correct Answer: C
The text states that 'the magnetic behavior of a material as a result of the configuration of magnetic dipoles in the material.' An alignment of these dipoles is a specific type of configuration that leads to strong magnetic behavior.
A) An electric current.
B) A magnetic material.
C) A moving electric charge.
D) A stationary electric charge.
Correct Answer: D
The text lists three things a magnetic field can exert a force on: 'moving electric charges, electric currents, or magnetic materials.' A stationary electric charge is not included in this list.
A) Magnetic dipoles that are difficult to align and resist external fields.
B) Magnetic dipoles that readily align with an external magnetic field.
C) No magnetic dipoles at all.
D) A magnetic field that only affects stationary charges.
Correct Answer: B
Magnetic permeability describes a material's response to a magnetic field. A high permeability means the material can easily support the formation of a magnetic field. This is a result of the material's internal magnetic dipoles readily aligning with the external field, thus enhancing it. This question requires synthesizing the concepts of permeability (point 3) and dipole configuration (point 2).
A) A north pole is always stronger than a south pole.
B) A south pole can exist in isolation, but a north pole cannot.
C) A north pole is never found without a corresponding south pole.
D) Magnetic poles do not exist in magnetic materials.
Correct Answer: C
The text directly states, 'No magnetic north pole is ever found in isolation from a south pole.' This means they always come in pairs.