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Chapter 25: Q. 36 (page 711)
A 5.0-cm-diameter metal ball has a surface charge density of . How much work is required to remove one electron from this ball?
The work is needed to remove one electron from the ball is
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a. Find an algebraic expression for the electric field strength at the surface of a charged sphere in terms of the sphere鈥檚 potential and radius .
b. What is the electric field strength at the surface of a -diameter marble charged to ?
The arrangement of charges shown in FIGURE P25.68 is called a linear electric quadrupole. The positive charges are located at. Notice that the net charge is zero. Find an expression for the electric potential on the y-axis at distances. Give your answer in terms of the quadrupole moment,.
FIGURE P25.69 shows a thin rod of length L and charge Q. Find an expression for the electric potential a distance x away from the center of the rod on the axis of the rod.
Two protons are launched with the same speed from point 1 inside the parallel-plate capacitor of FIGURE Q25.4. Points 2 and 3 are the same distance from the negative plate.
a. Is , the change in potential energy along the path , larger than, smaller than, or equal to ?
b. Is the proton's speed at point 2 larger than, smaller than, or equal to ? Explain.
What is the speed of an electron that has been accelerated from rest through a potential difference of ?
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