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Chapter 23: Q. 12 (page 653)
The electric field from a very long charged wire is (2000 N/C, toward the wire). What is the charge (in ) on a-cm-long segment of the wire?
The charge on a -cm-long segment of the wire is
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Rank in order, from largest to smallest, the electric field strengths to at the five points inFIGURE . Explain.
What are the strength and direction of the electric field at the position indicated by the dot in FIGURE EX23.4? Specify the direction as an angle above or below horizontal
A problem of practical interest is to make a beam of electrons turn a corner. This can be done with the parallel-plate capacitor shown in FIGURE. An electron with kinetic energy enters through a small hole in the bottom plate of the capacitor.
a. Should the bottom plate be charged positive or negative relative to the top plate if you want the electron to turn to the right? Explain.
b. What strength electric field is needed if the electron is to emerge from an exit hole away from the entrance hole, traveling at right angles to its original direction?
Hint: The difficulty of this problem depends on how you choose your coordinate system.
c. What minimum separation must the capacitor plates have?
Show that the on-axis electric field of a ring of charge has the expected behavior when and when.
FIGURE shows a hollow soda straw that has been uniformly charged with a positive charge. What is the electric field at the center (inside) of the straw? Explain.
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