College Physics
posted by Stephanie3 .
What must be the distance in meters between point charge q1 = 25.6 µC and point charge q2 = 69.6 µC for the electrostatic force between them to have a magnitude of 8.50 N?

k =9•10^9 N•m²/C²
F=k•q1•q2/r²
r=sqrt(k•q1•q2/F)=
=sqrt(9•10^9•25.6•10^6•69.6•120^6/8.5)= .....