Potential of Point-Charges: The potential (relative to infinity) at the midpoint of a square is 3.0 V when a point charge of +Q is located at one of the corners of the square. What is the potential (relative to infinity) at the center when each of the other corners is also contains a point charge of +Q?
A. 0 V
B. 3.0 V
C. 9.0 V
D. 12 V
Answer: D
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Which of these devices helps correct coma in fast reflectors?
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