Multiple Choice
Which pair correctly describes two observable effects of Earth’s magnetic field?
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28. Magnetic Fields and Forces
Magnets and Magnetic Fields
Multiple Choice
In the context of magnets and magnetic fields, all of the following can produce a magnetic field except which one?
A
A permanent bar magnet
B
A stationary electric charge
C
A straight wire carrying a steady current
D
A solenoid with current flowing through its coils
Verified step by step guidance1
Recall the sources of magnetic fields: magnetic fields are produced by moving electric charges (currents) or intrinsic magnetic moments of particles, such as those in permanent magnets.
Analyze each option: a permanent bar magnet produces a magnetic field due to aligned magnetic domains; a straight wire carrying a steady current produces a magnetic field due to moving charges; a solenoid with current flowing through its coils produces a magnetic field similar to a bar magnet.
Consider the stationary electric charge: since it is not moving, it does not produce a magnetic field, only an electric field.
Conclude that among the options, only a stationary electric charge does not produce a magnetic field.
Summarize that magnetic fields arise from moving charges or intrinsic magnetic moments, not from charges at rest.
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