1. The problem statement, all variables and given/known data If the electric field at a point in space has a magnitude of 300 volts/meter, about how far apart are the equipotential surfaces that differ by 10 volts? well, i think that they are 30 meters apart. All I did was 300 volts/meter/10 volts since that will cancel the volts out i believe and leaving me with 300 meter/10 which give 30 meters. I dont understand this question since my professor decided to skip this portion of the chapter and expect us to know it. Any help on understanding would be great.