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Chapter 18: Q8CQ (page 661)
What is grounding? What effect does it have on a charged conductor? On a charged insulator?
When a charged body is connected to the ground it becomes neutral.
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(a) How strong is the attractive force between a glass rod with a charge and a silk cloth with a charge, which are 12.0 cm apart, using the approximation that they act like point charges? (b) Discuss how the answer to this problem might be affected if the charges are distributed over some area and do not act like point charges.
If 1.80脳1020 electrons move through a pocket calculator during a full day鈥檚 operation, how many coulombs of charge moved through it?
(a) What magnitude point charge creates a \({\rm{10,000 N/C}}\) electric field at a distance of \(0.{\bf{250}}{\rm{ }}{\bf{m}}\)? (b) How large is the field at \({\bf{10}}.{\bf{0}}{\rm{ }}{\bf{m}}\)?
If two equal charges each of\({\rm{1 C}}\)each are separated in air by a distance of\({\rm{1 km}}\), what is the magnitude of the force acting between them? You will see that even at a distance as large as\({\rm{1 km}}\), the repulsive force is substantial because\({\rm{1 C}}\)is a very significant amount of charge.
Would the self-created electric field at the end of a pointed conductor, such as a lightning rod, remove positive or negative charge from the conductor? Would the same sign charge be removed from a neutral pointed conductor by the application of a similar externally created electric field? (The answers to both questions have implications for charge transfer utilizing points.)
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