A magnetic field is invisible ... marking the needle direction each time join the points to show the field lines The needle of a plotting compass points to the south pole of the magnet.

If you took introductory physics, you learned about the “fundamental forces.” It goes something like this: All interactions ...

That is, unless you’ve got one of these nifty magnetic field visualizers developed ... time and produce an approximation of what the field lines would look like on its electronic paper display.

One of the many unseen forces to which you owe your existence is magnetism. If it weren’t for the magnetic field that surrounds our planet, blocking cosmic radiation and solar wind, Earth would likely ...