Two 2.0 kg plastic garbage cans are sitting 2.6 meters apart on a sticky classroom floor (coefficient of static friction µs = 0.40). They are not moving. If the first one has a charge of 10 µC, find (a) the most negative possible charge and (b) the most positive possible charge for the other garbage can. Assume that the charges can be represented as point charges located at the cans' centers.