[问答题]
Determine the direction and magnitude of thle1o s+ 3nmavopek /gn+2a) 1we electric fielu2z/dxbq; vl*viw c,j,qin2 /d 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 two charg,q/bni2,vlj2wd u* c/ix q;vzes. Express your answer in terms of Q, x, a, and k.
