Which equation correctly states Coulomb's law?
I tried researching but the answers on my quiz don't match the equations I've searched.

Question

Which equation correctly states Coulomb's law? 
I tried researching but the answers on my quiz don't match the equations I've searched.

anonymous · Answer

Fe=kq1q2/R^2 ?

stormfire1 · Answer

What answers are on your quiz?  Columbs law states that $$|F|=k\frac{|Q_1Q_2|}{r^2}$$where: $$k=\frac{1}{4pi \epsilon_0}$$

anonymous · Answer

misha got it. thanks to both of you tho. :)

anonymous · Answer

@stormfire 1 is correct but the formula holds only for vacuum. In media , epsilon zero is replaced by epsilon which can be written as epsilon= epsilon zero*relative permittivity epsilon

stormfire1 · Answer

Good clarification!  I should have mentioned that.