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Surface charge density - balls EM-b3a
Separate two pairs of balls of different radius but same separation are attached to and charged simultaneously with the Wimhurst. Fishbane Chapter:   25.6 HRW 6th:   25.3 Reese Chapter:   17.5 Purcell Chapter:   3.4 SJ 3rd Chapter:   20.6 PIRA DCS classification:   5B30.10

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Physics Lecture Demonstrations at the Department of Physics and Astronomy
The Johns Hopkins University