Chapter 22: Q.2 (page 623)
Can a conductor be charged? If so, how would you charge a conductor? If not, why not?
We can charge the conductor through the process called conduction and induction.
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What are the electric fields at points 1, 2, and 3 in FIGURE P22.64? Give your answer in component form.
In Problems 69 through 72 you are given the equation(s) used to solve a problem. For each of these,
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.
FIGURE shows four charges at the corners of a square of side . What is the magnitude of the net force on?
What is the force on the charge in FIGURE P? Give your answer as a magnitude and an angle measured cw or ccw (specify which) from the -axis.
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