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Q. Three point charges, -6.3 x 10-9 C, -9.6 x 10-9 C, and +6.8 x 10-9 C, are fixed at different positions on a circle. The total electric potential at the center of the circle is -2100 V. What is the radius of the circle?

Q. An AA battery is connected to a parallel-plate capacitor having 4.00--diameter plates spaced 3 apart. How much charge does the battery move from one plate to the other?

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