Question
Figure 17 shows an electroscope. The leaves (made of metal foil) normally hang down, but they spread apart when the metal sphere on top touches a charged object. Explain.
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This is due to the conductive nature of the metal sphere. \[ \text{Charged Object} \rightarrow \text{Metal Sphere} \] Show more…
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Figure 26.9 showed how an electroscope becomes negatively charged. The leaves will also repel each other if you touch the electroscope with a positively charged glass rod. Use a series of charge diagrams to explain what happens and why the leaves repel each other.
When a negatively charged object comes into contact with the metal knob at the top of a neutral metal-leaf electroscope, the two leaves, which normally hang straight down, move apart. Explain why the leaves move apart. Explain how the metal-leaf electroscope can be used to indicate the amount of charge on the object. Is it necessary for the charged object to touch the electroscope to cause the leaves to move apart? Explain your reasoning.
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