That is, unless you’ve got one of these nifty magnetic field ... able to track the poles of a magnet in real-time and produce an approximation of what the field lines would look like on its ...

Bar magnets and horseshoe magnets are two of the most common shapes of magnet. The magnetic field is shown by lines with arrows that point from north to south. You can tell how old some coins are ...

Rather than use conventional copper electromagnets to create the magnetic field, their magnet is made with high ... and the ...

the angle at which magnetic field lines intersect the Earth. The turtles use these two pieces of information, which vary at every point on the planet's surface, as navigational markers that help ...