1. The problem statement, all variables and given/known data The equipotential curves in a certain region of an equipotential diagram in an xy plane are parallel to the y-axis and are equally spaced. The potential is increasing in the +x direction. Which direction would an electric field vector point in this region? 2. Relevant equations N/A 3. The attempt at a solution The equipotential lines are vertical, so the electric field lines must be in the x-direction since they run perpendicular to each other. Would they point in the positive x direction since the potential is increasing there? I'm having a hard time picturing what this would look like.