Answer:
Explanation:
Note the charge balls on the top and bottom row are identical. So those charges cancel each other out. The only charges in the net electric field are the two in the middle row.
Electric field strength = k*Q/r^2
= (8.99
*10^9) * (3-(-3)) * 5*10^(-6) / (2*0.5)^2
= 269700 N/C
