IB Physics: Coulomb's Law

Using the formula, please derive the SI unit for the constant K

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IB MCQ:

X and Y are two identical conducting spheres separated by a distance d. X has a charge +6 μC and Y has a charge –2 μC. The electric force between them is + F (ie attractive). The spheres are touched together and are then returned to their original separation d. The force between them now is
A.    +F.
B.    –F.
C.   +F/3   
D.    - F/3