Three point charges \( -Q, Q \) and \( Q \) are placed on a straigh...

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Three point charges \( -Q, Q \) and \( Q \) are placed on a straight line with distance d between chargesas shown. Find the magnitude of the electric field at the point \( P \) in the configuration shown which is at a distance a from middle charge \( Q \) in the system provided that \( a \gg d \). Take \( 2 Q d=p \).
\( \mathrm{P} \)
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