Science, Maths & Technology
DIY: Generate your own electricity
...base of the magnet, and fasten it by tightening the nut. Fix the bolt into the chuck of a hand drill. Next, fix the sharp end of the nail in a vice (or between two heavy books) so that it’s horizontal. Bring the magnet to within about 1mm of the nail head, which should be slightly off-centre from the middle of the spinning magnet. Make sure the gap between the magnet...