A thin wire carries a total charge of +15 µC uniformly distributed along the wire. The wire is placed with its center at the origin as shown in the figure. The length of the wire is 5 cm.The point of observation P shown as a yellow dot in the figure is 4.5 cm from the origin. (a) the net potential (in megaV) at point P (2 points); (b) direction of the net electric field at point P (left, right, up, or down) (1point); (c) the magnitude of the net electric field (in megaN/C) at point P (2 points).