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Four particles of charge q1 = q2 = q4 = +10 uC and q3 = -10 µC are arranged in the corners of a 9 cm-
side square. Point a is at the center of the square.
(a) Determine the electric field E at point a.
(b) Determine the amount of work required to relocate a charge q0 = +5 µC from very far away to point
b.

4 +10uC
9,-10µC
9cm

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