Two positive point charges, Q = 80 nC and q = 45 nC are held at rest one directly above the other a distance 17 cm apart. The top charge, q, has a mass m = 2.5 x 10-4 kg.
The bottom charge, Q, is held stationary and the top charge is released (initally from rest).
What will be the smallest distance between the two charges after the top charge is released?