Answer to Question #1437 in Electromagnetism for Maddie
Two charged objects separated by 21 cm have a repulsive force of 0.02 N. If the distance in charged to 7 cm, what will be be the resulting repulsive force?
The repulsive force is
F1 = kq1q2/R12
kq1q2 = F1R12
F2 =k q1q2/R22 = F1R12/R22 = 0.02*212/72 = 0.18 N.