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Chapter 14: Q7CP (page 546)
The mobility of the mobile electrons in copper is. How large an electric field would be required to give the mobile electrons in a block of copper a drift speed of ?
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Criticize the following statement: "Since an atom's electron cloud is spherical, the effect of the electrons cancels the effect of the nucleus, so a neutral atom can't interact with a charged object." ("Criticize" means to explain why the given statement is inadequate or incorrect, as well as to correct it.)
Explain in detail, including diagrams, what happens when a negatively charged tape is brought near your finger.
A positively charged sphere is placed near a neutral block of nickel, as shown in Figure 14.92. (a) Which of the diagrams in Figure 14.93 best represents the equilibrium distribution of charge on the neutral nickel block?
(b) At location P inside the nickel block the electric field due to the charged sphere is . At equilibrium, which of the following statements must be true? (1) It is not possible to determine the electric field at location P due only to charges on the surface of the nickel block. (2) The electric field at location P due only to charges on the surface of the nickel block is . (3) Because the net electric field at location P is , the field at P due only to charges on the surface of the polarized nickel block must be .
In Figure 14.84 there is a permanent dipole on the left with dipole moment and a neutral atom on the right with polarizability , so that it becomes an induced dipole with dipole moment , where is the magnitude of the electric field produced by the permanent dipole. Show that the force the permanent dipole exerts on the neutral atom is
A glass sphere carrying a uniformly distributed charge of is surrounded by an initially neutral spherical plastic shell (Figure 15.67).
(a) Qualitatively, indicate the polarization of the plastic. (b) Qualitatively, indicate the polarization of the inner glass sphere. Explain briefly. (c) Is the electric field at location P outside the plastic shell larger, smaller, or the same as it would be if the plastic weren鈥檛 there? Explain briefly. (d) Now suppose that the glass sphere carrying a uniform charge of is surrounded by an initially neutral metal shell (Figure 15.68). Qualitatively, indicate the polarization of the metal.
e) Now be quantitative about the polarization of the metal sphere and prove your assertions. (f) Is the electric field at location outside the metal shell larger, smaller, or the same as it would be if the metal shell weren鈥檛 there? Explain briefly.
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