Three charges \( 4 q, Q \), and \( q \) are placed in a straight line of length / at points \( 0...

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Three charges \( 4 q, Q \), and \( q \) are placed in a straight line of length / at points \( 0,1 / 2 \), and \( l \), respectively. What should be \( Q \) so as to make the force on q zero?
(A) \( -q / 2 \)
(B) \( -q \)
(C) \( -2 q \)
(D) \( -4 q \)
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