Four equal negative point charges are located at the corners of a square, their positions in the xy-plane being (1, 1) , (-1, 1) , (-1, -1) , (1, -1) . The electric field on the x-axis at (1, 0) points in the same direction as
A)
.
B)
.
C) - 
D)
.
E) -
.
Correct Answer:
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