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Try checking the Show Potential Contours
box in the "Controls" panel.
When you do, the background of the grid area
will light up with colored stripes.
These stripes show equipotentials
of the potential field;
that is, all the locations within a single stripe
have roughly the same electric potential value.
There are three special stripes:
a bright red one for a potential value of positive one,
a bright blue one for a potential value of negative one,
and a white stripe for a potential value of zero.
The light blue and light pink stripes are
equally spaced between these values and beyond them.
Can you figure out the step size in potential per stripe?
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