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- A magnetic field is a picture that we use as a tool to describe how the magnetic force is distributed in the space around and within something magnetic.
- Magnetic field lines never cross.
- Magnetic field lines naturally bunch together in regions where the magnetic field is the strongest. This means that the density of field lines indicates the strength of the field.
- Magnetic field lines don't start or stop anywhere, they always make closed loops and will continue inside a magnetic material.
- https://www.khanacademy.org/science/physics/magnetic-forces-and-magnetic-fields/magnetic-field-current-carrying-wire/a/what-are-magnetic-fields
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