• Charge the plastic electrophorus plate negative by rubbing it with fur. Placing the metallic plate on top of the plastic plate and connecting it to a grounding wire will give the metallic plate a positive charge by induction.
  Existence of these charges can be verified using the electroscope. The plastic
  plate should retain its negative charge long enough for demonstrator to charge metal plate several times.

Location

• Electrophorus demo: L01, section A2, top shelf.
• Electroscope: L01, section A2.