Electromagnetic fields are everywhere, all around us. Some are generated naturally, but in vast majority of cases, it’s we humans that are generating them with artificial, electronic means. Everything ...

2N2222 devices used, but practically any junkbox NPN will do Electromagnetic fields are everywhere, all around us. Some are generated naturally, but in vast majority of cases, it’s we humans that are ...

Editor's Note: The last electroscope I used employed gold leaves or pith balls to indicate charge, but here's an electronic version with no moving parts. Though one of our reviewers felt the design ...

A nonmetal desk or table (For example, a wooden, plastic or glass desk or table would work.) At least one material to test (It should be no larger than the plate or can be folded to be small and able ...