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Chapter 26: Q. 19 (page 738)
How much work does the electric motor of a Van de Graaff generator do to lift a positive ion if the potential of the spherical electrode is ?
Work done is
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What are the charge on and the potential difference across each capacitor in FIGURE ?
To what potential should you charge a capacitor to store of energy ?
The metal spheres are charged to . Draw this figure on your paper, then draw a plausible contour map of the potential, showing and labeling the equipotential surfaces.
What is the potential difference in Figure EX26.16?
Consider a uniformly charged sphere of radius R and total cAlC charge Q. The electric field outside the sphere is simply that of a point charge Q. In Chapter 24, we used Gauss's law to find that the electric field inside the sphere is radially outward with field strength
a. The electric potential outside the sphere is that of a point charge Q. Find an expression for the electric potentialat position r inside the sphere. As a reference, let at the surface of the sphere.
b. What is the ratio
c. Graph V versus r for 0 r 3 R.
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