Magnetism and Electromagnetism
Which of the following is a fundamental property of magnetic fields?
They are produced by isolated magnetic monopoles.
They exert a force on stationary electric charges.
They are vector fields that exert a force on moving electric charges.
They always point towards the Earth's geographic north pole.
The density of magnetic field lines indicates the:
Direction of the magnetic force on a positive charge.
Speed of charged particles moving through the field.
Strength of the magnetic field.
Type of material creating the magnetic field.
Three parallel wires each carry a current perpendicular to the page. Two of the wires carry current into the page, and one carries current out of the page. If the wires are arranged in an equilateral triangle, what is the direction of the net magnetic field at the center of the triangle?
The net magnetic field is zero.
The net magnetic field points toward the wire with current coming out of the page.
The net magnetic field points toward the midpoint of the side connecting the two wires with current going into the page.
The net magnetic field points away from the midpoint of the side connecting the two wires with current going into the page.
A material is placed in a strong magnetic field and is observed to be weakly attracted to it. When the field is removed, the attraction disappears. This material is best classified as:
Ferromagnetic
Paramagnetic
Diamagnetic
Non-magnetic
In which type of material do magnetic dipoles align temporarily with an external magnetic field, but return to random orientations when the field is removed?
Ferromagnetic
Paramagnetic
Diamagnetic
Superconducting
A ferromagnetic material is heated to a temperature above its Curie temperature. How does this affect its magnetic properties?
It becomes diamagnetic.
It becomes paramagnetic.
It becomes a stronger ferromagnet.
Its magnetic properties are unaffected.
Which of the following best describes magnetic permeability?
The resistance of a material to magnetic fields.
The ability of a material to conduct electric current.
The measure of how much a material can be magnetized in response to an external magnetic field.
The temperature at which a material loses its magnetism.

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How does the magnetic permeability of iron compare to the magnetic permeability of a vacuum?
Iron has a much lower magnetic permeability than a vacuum.
Iron has approximately the same magnetic permeability as a vacuum.
Iron has a slightly lower magnetic permeability than a vacuum.
Iron has a much higher magnetic permeability than a vacuum.
A cylindrical rod of a certain material with a relative permeability is inserted into a long solenoid. If the magnetic field inside the solenoid without the rod is , what is the magnetic field inside the solenoid with the rod inserted?
Which of the following statements is correct regarding magnetic monopoles?
Magnetic monopoles are commonly observed in nature.
Magnetic monopoles have been experimentally confirmed and are used in modern technology.
Magnetic monopoles are purely theoretical and have never been observed experimentally.
Magnetic monopoles are responsible for the Earth's magnetic field.