Chapter 22: Q. 29 - Excercises And Problems (page 625)
What magnitude charge creates a 1.0 N/C electric field at a point 1.0 m away?
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Two neutral metal spheres on wood stands are touching. A negatively charged rod is held directly above the top of the left sphere, not quite touching it. While the rod is there, the right sphere is moved so that the spheres no longer touch. Then the rod is withdrawn. Afterward, what is the charge state of each sphere? Use charge diagrams to explain your answer.
Reproduce FIGURE on your paper. Then draw a dot (or dots) on the figure to show the position (or positions) where an electron would experience no net force.
Can a conductor be charged? If so, how would you charge a conductor? If not, why not?
In Section we claimed that a charged object exerts a net attractive force on an electric dipole. Let’s investigate this. FIGURE CP22.77 shows a permanent electric dipole consisting of charges +q and -q separated by the fixed distance s. Charge +Q is the distance r from the center of the dipole. We’ll assume, as is usually the case in practice, that s V r.
a. Write an expression for the net force exerted on the dipole by charge +Q.
b. Is this force toward +Q or away from +Q? Explain.
c. Use the binomial approximation nx if x V 1 to show that your expression from part a can be written Fnet = 2KqQs/r3 .
d. How can an electric force have an inverse-cube dependence? Doesn’t Coulomb’s law say that the electric force depends on the inverse square of the distance? Explain.
Charged plastic and glass rods hang by threads.
a. An object repels the plastic rod. Can you predict what it will do to the glass rod? If so, what? If not, why not?
b. A different object attracts the plastic rod. Can you predict what it will do to the glass rod? If so, what? If not, why not?
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