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Two point charges \( (+Q) \) and \( (-2 Q) \) are fixed on the \( x \)-axis at positions \( a \) and \( 2 a \) from origin, respectively. At what positions on the axis, the resultant electric field is zero?
(A) \( x=\sqrt{2} a \)
(B) \( x=-\sqrt{2} a \)
(C) \( x=\pm \sqrt{2} a \)
(D) \( x=\frac{3 a}{2} \)
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