Spacing of field lines

1. The problem statement, all variables and given/known data

2. Relevant equations

3. The attempt at a solution
The given field lines are at a maximum distance exactly midway between the charges but I don’t know which equation to use to find it.

Any help is appreciated. Thanks!

Attached Images
File Type: png electric field spacing.png (7.2 KB)
File Type: jpg 4139-small.jpg (17.0 KB)

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