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C) V<0
D) none of the above
13. A square is 1.0 m on a side. Point charges of +1C and -1 C are placed in two diagonally
opposite corners. In the other two corners two charges of +100.0 C and -100.0 C are
placed. What is the potential (relative to infinity) at the midpoint of the square? (k=
1/4xe0 = 9.0 x 109 N m2/C2)
A) 1.0 × 104 V
B) 1.0 x 105 V
C) 1.0 x 106 V
D) 0 V
E) infinite
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