Homemade compass. For this trick you need needle, piece of cork, magnet, plate and some water. You need to magnetize a needle and put it on the cork which floating in the plate with water. The needle ...
Lenz’s Law is one of those physics tricks that look like magic if you don’t understand what’s happening. [Seth Robinson] was inspired by the way eddy currents cause a cylindrical neodymium magnet to ...