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Four charges q1, q2, q3 and q4, are placed at the corners of a square. Charges...

Four charges q1, q2, q3 and q4, are placed at the corners of a square. Charges q1 and q4 are located on opposite corners and have equal charges. Both q2 and q3 have a charge of 1.0 C. If the force on q2 is zero, what is the charge on q1?

A. -1.0 C

B. -0.35 C

C. -0.71 C

D. -0.20 C

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