The Electric Field Due to an Electric Dipole . 19 Figure 22-40 shows an electric dipole. What are the (a) magni- tude and (b) direction (relative to the positive direction of the x axis) of the dipole's electric field at point P, located at distance r > d? +q + d/2 X d/2 The Electric Field Due to a Line of Charge . 27 In Fig. 22-46, two curved plastic rods, one of charge +q and the other of charge -q, form a circle of radius R = 8.50 cm in an xy plane. The x axis passes through both of the connecting points, and P the charge is distributed uniformly on -q both rods. If q = 15.0 pC, what are the (a) magnitude and (b) direction (relative to Fig. 22-46 the positive direction of the x axis) of the Problem 27. electric field E produced at P, the center of the circle? The Electric Field Due to a Charged Disk .34 A disk of radius 2.5 cm has a surface charge density of 5.3 AC/m on its upper face. What is the magnitude of the electric field produced by the disk at a point on its central axis at distance z = 12 cm from the disk