A dielectric (the University Phone Directory) is inserted between the plates of a charged capacitor, and the effect is observed on an electroscope.

1. See 5C10.1 Parallel-Plate Capacitor. The only modification is to add the phone book between the plates of the capacitor.

2. The charge on the electroscope should change, depending on how much of the phone book is inserted between the plates.

Parallel Plate Capacitor and phone book in E. E&M, 1B

Rods and Fur in G. E&M, 1C

Electroscope in G. E&M, 1C

Wire Leads in L. Misc

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Columbia University Physics Lecture Demonstrations

5C20.1 Capacitor with Dielectric