Three point charges, 
and
are located at the vertices of an equilateral triangle. If 
what value must q3 have so that the total potential energy of the arrangement is zero?
A. q1
B. 0.5 q1
C. -0.5 q1
D. (q1+ q2)/2
E. no value will have this result
C. -0.5 q1
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