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 test charge of \({\rm{ + 2 \mu C}}\) is placed halfway between a charge of \({\rm{ + 6 \mu C}}\) and another of \({\rm{ + 4 \mu C}}\) separated by \(10{\rm{ cm}}\). (a) What is the magnitude of the force on the test charge? (b) What is the direction of this force (away from or toward the \({\rm{ + 6 \mu C}}\)charge)?
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.
(a) In Figure 18.59, four equal charges \(q\) lie on the corners of a square. A fifth charge \(Q\) is on a mass \(m\) directly above the center of the square, at a height equal to the length \(d\) of one side of the square. Determine the magnitude of \(q\) in terms of \(Q\), \(m\), and \(d\), if the Coulomb force is to equal the weight of \(m\). (b) Is this equilibrium stable or unstable? Discuss.
Figure 18.59 Four equal charges on the corners of a horizontal square support the weight of a fifth charge located directly above the center of the square.
Figure 18.47 shows the electric field lines near two charges q1 and q2. What is the ratio of their magnitudes? (b) Sketch the electric field lines a long distance from the charges shown in the figure.
Figure 18.47 The electric field near two charges
Discuss pros and cons of a lightning rod being grounded versus simply being attached to a building.
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