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5. One by one, four point charges are brought in from infinity to form the
configuration shown in the diagram.
91 = 1.00 uC, 92 = 2.00 µC, q3 = 3.00 µC, q4 = 4.00 µC,
a) Assuming that q is held at its desired location, what amount of energy is
required to bring q2 to its desired location?

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