When the charges are measured in coulombs,?

Question

When the charges are measured in coulombs, the distance is measured in meters, and the force is measured in newtons, the constant, K, is___

a- 1

b- 1.60 x 10^-19C

c- 9.0 x 10^9 N.m^2/C^2

d- unknown

Answer 1

c. 9.0 x 10^9 N.m^2/C^2

http://hyperphysics.phy-astr.gsu.edu/hba...

http://en.wikipedia.org/wiki/Coulomb%27s...