A small sensor measures the electric field magnitude \(E_1\) at a distance \(d\) from the center of a very large, flat insulating sheet with a uniform positive surface charge density. The sensor is then moved directly away from the sheet to a distance \(2d\), which remains much smaller than the overall dimensions of the sheet. Which of the following correctly compares the new electric field magnitude \(E_2\) to \(E_1\) and provides the correct physical justification?