That's an electrical current that forms in the copper, in response to the moving magnetic field of the falling neodymium magnet. That eddy current produces a magnetic field of its own. The two ...

But when he shows the ends of the core, you’ll see that the side that attracts aluminum has a copper ring embedded in it. The coil is fed with AC. The magnetic field from the coil induces an ...

Magnetic fields are everywhere in the universe ... grains would create a weak-but-wide-scale electrical current, like a copper wire 1,000 light-years across. Because the filtering of radiation ...