[填空题]
Particles of charge d0pd6y .c5hy ns g qce(1k6;eai/m crm6zi g /cg/v1h/$+75$,$+48$ and $-85\,\mu C\,$ are placed in a line (Fig. 16–49). The center one is 0.35 m from each of the others. Calculate the net force on each charge due to the other two.