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Three point charges q1, q2, and q3 are situated at three corners of a rectangle as...

Three point charges q1, q2, and q3 are situated at three corners of a rectangle as shown in the diagram below. Here q1 = +9.00 µC, q2 = −9.00 µC, q3 = +2.00 µC.

https://www.webassign.net/webassignalgphys1/19-p-026.gif

(a) What is the electric potential at the free corner where there is no charge? V

(b) What charge should be placed at the free corner for the electric potential at the center of the rectangle to be zero? Include both magnitude and sign if applicable. µC

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