Multiple Choice
A long straight wire carries a current upward. At a point located to the east of the wire, what is the direction of the magnetic field produced by the current at that point?
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28. Magnetic Fields and Forces
Magnets and Magnetic Fields
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Boron is classified as which type of magnetic material under ordinary conditions?
A
Paramagnetic (weakly attracted by an external magnetic field)
B
Ferromagnetic (strongly attracted and can retain magnetization)
C
Superconducting (perfectly expels magnetic fields via the Meissner effect)
D
Diamagnetic (weakly repelled by an external magnetic field)
Verified step by step guidance1
Understand the classification of magnetic materials: materials can be diamagnetic, paramagnetic, ferromagnetic, or superconducting based on their response to external magnetic fields.
Recall that diamagnetic materials create an induced magnetic field in the opposite direction to the applied magnetic field, causing a weak repulsion.
Recognize that paramagnetic materials have unpaired electrons that align weakly with an external magnetic field, causing weak attraction.
Know that ferromagnetic materials have strong interactions between magnetic moments, leading to strong attraction and the ability to retain magnetization.
Identify that boron, under ordinary conditions, exhibits diamagnetic behavior, meaning it is weakly repelled by an external magnetic field.
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