He image shows the electric field lines around two charged particles.

2 balls separated vertically. Lines with arrowheads run from the top ball to the bottom ball, curving more and more outward and then inward as they occur further from the shortest line connecting the balls. Curved lines with arrowheads point to the bottom ball from below and from the top ball upward. Label 1 is at the top left of the whole diagram. Label 2 is at the top right somewhat closer to the top ball than 1. Label 4 is midway between the balls on the shortest line connecting them. Label 3 is several lines to the left of 4.
At which position would the electric force be greatest?

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