[问答题]
Determine the directk4; im. it u4v.fupr;jics ,orpjfq8a,)5af*gwngq3dy 5 ,/gf on and magnitude of the electric field at the point P in Fig. 16–54. The charges are separated by a distance 2a, and point P is a distance x from the midpoint between the f gj5,gs)aw/dfqgcf ,qy,r5pa o8n3 *two charges. Express your answer in terms of Q, x, a, and k.
