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72. At each corner of a cube of side l there is a point charge Q.
Fig. 23-34. (a) What is the potential
at the center of the cube (V = 0 at
r = o0)? (b) What is the potential
at each corner due to the other
seven charges? (c) What is the total
potential energy of this system?
FIGURE 23-34
Problem 72.

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