Two point charges \( +8 q \) and \( -2 q \) are located at \( x=0 \) and \( x=L \) respectively....

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Two point charges \( +8 q \) and \( -2 q \) are located at \( x=0 \) and \( x=L \) respectively. The location of a point on the \( x \) axis at which the net electric field due to these two point charges is zero is
(a) \( 8 L \)
(b) \( 4 L \)
(c) \( 2 L \)
(d) \( L / 4 \)
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