An equation, or several of them together, can be solved for the force values at any point or succession of points within the field. The field math gives an answer, in volts, for how tight the rubber band is, how hard it is trying to pull the two charges together.
Charges carry their own magnetic force, too.
These fields all have two ends, or poles, just like familiar representations of bar magnets. Whenever many fields are present, the overall picture may become a chaotic welter of contours and eddies.