Mathematics
OpenStudy (anonymous):

how can we get electric field from electric potential?

OpenStudy (experimentx):

Let V be your electric potential and E be your electric field, $\vec E =-\vec \nabla V$ Where $\nabla = \vec i \frac{\delta}{\delta x} + \vec j \frac{\delta}{\delta y} + \vec k \frac{\delta}{\delta z}$