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Do I really have to work? Suppose we have charges along the ry plane, where charge q1 = +Q is
at (0, a), and another charge q2 = +Q is at (–2a, 0). What would be the work needed by an external
force if we want to move charge q3 = -Q from infinity to the origin (0, 0)?
3kQ?
А.
kQ²
С. +
2a
-
2a
kQ?
В.
3kQ?
D. +
2a
2a

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