When using the Coulomb's law equation to determine the electrostatic force between two objects, what does the in the formula represent?

Question

When using the Coulomb's law equation to determine the electrostatic force between two objects, what does the  in the formula represent?

Quizplus · Accepted Answer

The magnitude of the electrostatic force between two point-like charges is given by Coulomb's Law:
 11ec0fda_998c_52ec_a67f_2f58e0309206_NR0004_00 Q1 =  the charge on the point-like object one,
Q2 =  the charge on the point-like object two
r =  the distance between the two objects
k =  the proportionality constant
 11ec0fda_998c_52ed_a67f_97f2d8165255_NR0004_00

When Using the Coulomb's Law Equation to Determine the Electrostatic