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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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.
12. Two conducting spheres are hanging near each other. They are attracting each other. You know that one of the spheres is neutral. Diagram the charges on the spheres and explain why they attract each other. 13. A neutral electroscope is charged by conduction. Diagram the process. 14. A positively charged rod is brought near a negatively charged electroscope. Diagram the position of the charges on the electroscope and tell if the leaf will stand out while the rod is near. 15. A negatively charged rod is brought near a negatively charged electroscope. Diagram the position of the charges on the electroscope and tell if the leaf will stand out while the rod is near.
Penny R.
SSM In Fig. $23-49,$ a small, nonconducting ball of mass $m=1.0 \mathrm{mg}$ and charge $q=2.0 \mathrm{x}$ $10^{-8} \mathrm{C}($ distributed uniformly through its vol- ume) hangs from an insulating thread that makes an angle $\theta=30^{\circ}$ with a vertical, uniformly charged nonconducting sheet (shown in cross sec- - tion). Considering the gravitational force on the ball and assuming the sheet extends farce on the ball and and out of the page, calculate the surface charge density $\sigma$ of the page, calculate the surface charge density $\sigma$ of the sheet.
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