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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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Consider identical spherical conducting space ships in deep space where gravitational fields from other bodies are negligible compared to the gravitational attraction between the ships. Construct a problem in which you place identical excess charges on the space ships to exactly counter their gravitational attraction. Calculate the amount of excess charge needed. Examine whether that charge depends on the distance between the centers of the ships, the masses of the ships, or any other factors. Discuss whether this would be an easy, difficult, or even impossible thing to do in practice.
(a) Common transparent tape becomes charged when pulled from a dispenser. If one piece is placed above another, the repulsive force can be great enough to support the top piece鈥檚 weight. Assuming equal point charges (only an approximation), calculate the magnitude of the charge if electrostatic force is great enough to support the weight of a\[{\bf{10}}.{\bf{0}}{\rm{ mg}}\]piece of tape held\[{\bf{1}}.0{\bf{0}}{\rm{ cm}}\]above another. (b) Discuss whether the magnitude of this charge is consistent with what is typical of static electricity.
(a) Sketch the electric field lines near a point charge +q (b) Do the same for a point charge -3.00q.
What is the repulsive force between two pith balls that are 8.00cm apart and have equal charges of -30.0 nC ?
The discussion of the electric field between two parallel conducting plates, in this module states that edge effects are less important if the plates are close together. What does close mean? That is, is the actual plate separation crucial, or is the ratio of plate separation to plate area crucial?
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