[填空题]
A point charge is placed 36 cm frm fj-r)y5i;vl2v)e4tcxe z b/om a51: dynpb ly1tn identical $+33\mu C$ charge. A $-1.5\mu C$ charge is moved from point a to point b in Fig. 17–34. What is the change in potential energy? $\approx$ J (round to one decimal place)
