1)Clear the charges and place one positive charge in the center of the grid, on the intersection of major gridlines. Grab a voltage sensor, and move it around the grid, observing how the values change. Then, do the same for one negative charge in the center of the grid. 2)Create an electric dipole by placing one positive and one negative charge on a horizontal grid line. Measure the electric field and electric potential at the point midway between the charges and at several points on the vertical line bisecting the line segment connecting the charges. 3)Create a charge configuration similar to that of a dipole but use two charges of the same sign instead. Measure the electric field and electric potential at the point midway between the charges and at several point on the vertical line bisecting the line segment connecting the charges. 4)Based on your data, what is the main difference between the superposition principle for the electric fields and electric potential