P23_014 - 14. Since both charges are positive (and aligned...

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Unformatted text preview: 14. Since both charges are positive (and aligned along the z axis) we have Enet = For z q q 1 + 2 4πε0 (z − d/2) (z + d/2)2 d we have (z ± d/2)−2 ≈ z −2 , so Enet ≈ 1 4πε0 q q +2 z2 z = 2q . 4πε0 z 2 . ...
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