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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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In Problems 69 through 72 you are given the equation(s) used to solve a problem. For each of these,
A plastic rod that has been charged to -15 nC touches a metal sphere. Afterward, the rod鈥檚 charge is -10 nC.
a. What kind of charged particle was transferred between the rod and the sphere, and in which direction? That is, did it move from the rod to the sphere or from the sphere to the rod?
b. How many charged particles were transferred?
The net force on thecharge in FIGUREis zero What is
In Section we claimed that a charged object exerts a net attractive force on an electric dipole. Let鈥檚 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鈥檒l 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鈥檛 Coulomb鈥檚 law say that the electric force depends on the inverse square of the distance? Explain.
What is the force on the charge in Figure ? Give your answer as a magnitude and a direction.
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