Index Symbols | D | E | G | H | K | P | S | V Symbols $\phi$ = Electrical flux [], [1] D demonstration statistics E Electrical charge (q), [1] Electrical Field, [1] Electroscope, [1] G Gauss' Law, [1] Gaussian surface, [1] H how to demonstrate K knowledge retention P Perimitivty of vacuum ($$\epsilon_{0}$$), [1] popular demonstrations presenting demonstrations S student engagement V Van de Graaff generator, [1]