The force acting between two charged particles A and B is 5.2 × 10-5 newtons. Charges A and B are 2.4 × 10-2 meters apart. If the charge on particle A is 7.2 × 10-8 coulombs, what is the charge of particle B?
(k = 9.0 × 109 newton·meters2/coulomb2)

A.
2.4 × 10-2 coulombs
B.
4.6 × 10-11 coulombs
C.
5.2 × 10-11 coulombs
D.
7.2 × 10-8 coulombs