Separation of charge using electrical tape and an electroscope.

5A10.35 • D+10+16

Separation of charge in electrical tape. Press a short piece of tape onto the top disk of the Braun Electroscope so that it is very well stuck. (Scotch double-stick foam tape with the wrapper left on one side, or Scotch Polyester tape [#1022 in stockroom] both work well.) Pull the tape smoothly up. The metal pointer of the electroscope will deflect, indicating the presence of a charge. The charge left on the electroscope is negative. The charge left on the tape is positive. (Supposedly the positive tape could be placed on a second electroscope, which would register the charge. But there is too much leakage, and the electroscope is not sensitive enough.)