Imagine two equal but opposite point charges. Now, bring them closer together, until they are almost touching. How would the equipotential lines change?

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Observe the animation above. Notice that as the two point charges approach each other, the potential is slowly reduced, so that when they touch, it appears that there are no charges in the region.

The same is true when you observe two point charges from a sufficient distance. If your distance from the charges is significantly greater than their separation distance, it will be difficult to detect the presence of a charge.


Are those equipotential lines?

The lines you see on this animation are not equipotential lines. Their only purpose is to mark the coordinates of the points. They have no other meaning.