Faraday's drawings

Two charges \(+q\) and \(-q\) are separated by a distance \(d=50~\mbox{cm}\). The electric field lines for this system form the the well-known pattern showed in the figure below. Consider two lines \(L_{1}\) and \(L_{2}\) lying on the same plane and leaving the positive charge at \(\alpha=\pm 45^{\circ}.\) What is the maximum distance \(D\) between the lines in centimeters.

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