Basics Summary

[ul] [li]When rubbed, polythene or ebonite, becomes charged negatively (excess of electrons)[/li] [li]Cellulose Acetate (Glass) become charged positively, in this situation[/li] [li]Like charges repel, unlike charges attract[/li] [li]A gold-leaf electroscope can be used to detect charged. Charges are measured in coulombs[/li] [li]A conductor allows electrons to move through it; an insulator doesn't.[/li] [li]Objects with sharp points lose their charge easily. This is used in a lightning conductor. Capacitors are used to store charges.[/li] [/ul] [highlight][b]Gold Leaf Electroscope[/b] Gold-Leaf electroscopes look like this when no charge is applied to the top disc: [img src='https://res.cloudinary.com/deylrqt2d/image/upload/v1487809166/uncharged-electroscope_skv1wv.gif'] And when a charge is applied, the entire thing gets charged, repelling the delicate gold leaf with an obvious reaction: [img src='https://res.cloudinary.com/deylrqt2d/image/upload/v1487809251/charged-electroscope_s3dx9w.gif'] [/highlight]