To extend the observations of home experiment 1, a simple electroscope can also be constructed. Use light aluminum foil as the leaves, which can be suspended from a paper clip. One end of the clip can be straightened, poked through a piece of cardboard, and rebent. Place the piece of cardboard on top of a drinking glass or a glass jar (see the drawing), and your electroscope is complete.
a. Test your electroscope with some of the materials suggested in home experiment 1.
b. Test the conductivity of different materials, as in section 12.2.
c. Try charging a metal spoon by induction. Wrap the handle of the spoon in a napkin, so that you will not discharge it when you handle it. Test the charge on the spoon with your electroscope.