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Discover LudwigThe phrase "magnetic field" is a perfectly valid and usable phrase in written English.
You can use it to refer to a non-static, non-uniform region around a magnet in which a magnetic force is exerted. For example, you could say "The iron filings showed the shape of the magnetic field around the magnet."
Dictionary
magnetic field
noun
A condition in the space around a magnet or electric current in which there is a detectable magnetic force and two magnetic poles are present B-field H-field
Exact(60)
Magnetization versus magnetic field.
Magnetic field of a bar magnet (Credit: Wikimedia Commons).
An externally applied magnetic field is required.
Magnetotactic bacteria sense Earth's magnetic field.
(Charged particles travel along magnetic field lines).
And the Sun's magnetic field gets tilted.
No magnetic field, no momentum measurement.
Electric and magnetic field energy.
Figure 1b: Magnetic field strength.
It is transmitted by the magnetic field.
Lattice response to temperature and magnetic field.
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Since I tried Ludwig back in 2017, I have been constantly using it in both editing and translation. Ever since, I suggest it to my translators at ProSciEditing.

Justyna Jupowicz-Kozak
CEO of Professional Science Editing for Scientists @ prosciediting.com