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Chapter 23: Q. 17 (page 654)
The electric field strengthfrom the surface of adiameter metal ball is. What is the charge on the ball?
Charge on the ball is.
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What are the strength and direction of the electric field at the position indicated by the dot in FIGURESpecify the direction as an angle above or below horizontal.
A sphere of radius R has charge Q. The electric field strength at distanceis. What is the ratio of the final to initial electric field strengths if
(a) Q is halved,
(b) R is halved, and
(c) r is halved (but is still)? Each part changes only one quantity; the other quantities have their initial values
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?
Twodiameter charged rings face each other,apart. Both rings are charged to. What is the electric field strength at (a) the midpoint between the two rings and (b) the center of the left ring?
One type of ink-jet printer, called an electrostatic ink-jet printer, forms the letters by using deflecting electrodes to steer charged ink drops up and down vertically as the ink jet sweeps horizontally across the page. The ink jet forms diameter drops of ink, charges them by spraying electrons on the surface, and shoots them toward the page at a speed of . Along the way, the drops pass through two horizontal, parallel electrodes that are wide, and spaced apart. The distance from the center of the electrodes to the paper is . To form the tallest letters, which have a height of , the drops need to be deflected upward (or downward) by . What electric field strength is needed between the electrodes to achieve this deflection? Ink, which consists of dye particles suspended in alcohol, has a density of .
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