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For more advanced classes, the electrophorus and condensing electroscope together provide a great working example of capacitance. Includes detailed instructions and reproducible student worksheets for each demonstration.
Concepts: Static electricity, positive and negative charges, electroscopes, electrophorus, Faraday cage, repulsive forces, induction, conduction.
Time Required: 35 minutes
Materials Provided: Aluminum foil, pin, plastic tubing, PVC tubes, comb, electrophorus disks, Erlenmeyer flasks, rod-hook-rubber stopper assemblies, friction pads, friction rods, insulated electrophorus disk handles, self-adhesive foot pads, insulating acrylic plate, metal strainer (Faraday cage), metal tube (“ice pail”), nut for disk handle, syringe, washer.
MS-ESS2-1: Develop a model to describe the cycling of Earth’s materials and the flow of energy that drives this process.