Clear everything and remake the equilateral triangle at the bottom of the grid, just above the bottom toolbar. This time, make the side lengths of the triangle 50 cm. Use the voltmeter to investigate the potential. You are encouraged to draw many equipotential lines, particularly in the interesting region above the negative charge. As you move farther and farther away from the charge distribution, the equipotential lines start to take on a uniform appearance. What does this remind you of