A. What is the net electric force on the change at the origin?
b. What is the net electric field at the position of
the charge at the origin?
у
5.0 nC
-0.30 m
6.0 nC
2
0.10 m
1
-3.0 nC
Figure 17-28

Two 2.0-cm-diameter disks face each other, 1.0 mm apart. they are charged to ±10 nc. what is the electric field strength between the disks? a proton is shot from the negative disk toward the positive disk. what launch speed must the proton have to just barely reach the positive disk?