static electricity

No charge on the inside surface of a hollow charged conductor

No charge on the inside surface of a hollow charged conductor The electric conductors used in the experiments we have described are generally made of hollow brass or else of wood covered with tinfoil. No advantage is to be gained by making them of solid metal, since the charge resides only on the outside surface. The following experiments …

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Distribution of charge over the surface of a conductor

Distribution of charge over the surface of a conductor A proof plane and gold-leaf electroscope may be used to investigate the distribution of charge over the surface of a conductor, by pressing the proof plane into contact with the surface at various places in turn and then transferring the charge to the electroscope (Fig. 32.12). The divergence of …

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Need for care when using a gold-leaf electroscope

Need for care when using a gold-leaf electroscope Fig. 32_11 shows what happens when a strong negative charge is brought near to the cap of a positively charged electroscope. Starting with the charge high above the cap, the leaf divergence decreases as the positive charge on the leaf and plate become partially neutralized by free electrons which …

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Charging a gold-leaf electroscope by induction

Charging a gold-leaf electroscope by induction When the method of charging a gold-leaf electroscope by contact was described earlier in this chapter it was pointed out that the method is unreliable and quite likely to give unexpected results. It is much better to charge an electroscope by induction. Figs. 32.8 and 32.9 illustrate the process, which is identical …

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Source of the electric energy obtained from an electrophorus

Source of the electric energy obtained from an electrophorus Allowing for the inevitable slight leakage of charge from the slab, the brass disc may be charged very many times before the slab needs recharging. At first sight it might appear that these charges on the brass disc are being created from nothing. However, a closer examination of the …

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