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The speed of the dots do in some way represent the strength of the field.
More animations Negative charges: Positive charges:

Fieldstrength Potential
The color shows the magnitude of the field around the charges. Note the points between charges of the same sign where the field is zero. The color shows the potential around the charges.
= 0 < 0 > 0
The same images as above, but with higher contrast - so that it's easier to see the change of fieldstrength/potential between the charges.

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