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一、器材:如图,A是紫外灯,B是锌板(可取电池的锌皮),C是泡沫塑料,D是验电器。另外有一根有机玻璃棒和一块丝绸。二、方法: (1)不接通紫外灯电路,用丝绸摩擦有机玻璃棒,把带正电的有机玻璃棒移近锌板(不要太近,以免放电)。由于静电感应,可观察到验电器箔片张开,移走有机玻璃棒,可观察到验电器箔片合上。这说明此时锌板不带电,与丝绸摩擦过的有机玻璃棒带电。
First, the equipment: as shown in the figure, A is a UV lamp, B is a zinc plate (desirable battery zinc skin), C is a foam plastic, D is an electroscope. There is also a plexiglass rod and a piece of silk. Second, the method: (1) does not turn on the UV lamp circuit, the plexiglass rod with silk friction, the plexiglass rod with positive electricity near the zinc plate (not too close to avoid discharge). Due to the electrostatic induction, the electroscope foil can be observed to open and the plexiglass rod can be removed, and the electroscope foil can be observed to close. This shows that the zinc plate is not charged at this time, and the plexiglass rod frictioned with the silk is charged.