Two point charges Q1 = 1 μC and Q2 = 3 μC, located in a vacuum, interact with each other

Two point charges Q1 = 1 μC and Q2 = 3 μC, located in a vacuum, interact with each other with a force F = 0.1H. Determine the distance between charges.

The force acting between charges is determined by Coulomb’s law:
F = 1/4 * π * έ * έ0 * q1 * q2 / r ^ 2.
Hence we get r ^ 2 = 1/4 * π * έ * έ0 * q1 * q2 / F,
r = √1 / 4 * π * έ * έ * q1 * q2 / F = √1 / 4 * π * 8.85418782 * 10 ^ 12 * 10 ^ -6 * 3 * 10 ^ -6 = 0.3m = 30cm.
It should be noted that the values of the charges given in McC must be converted to C, so the action takes place in a vacuum έ = 1.