Answer:
Coulomb's law
Step-by-step explanation:
The correct answer is Coulomb's law and it deals with particles which undergo interactions based on their electric charges.
It states that the electrostatic force acting between two charged particles is directly proportional to the product of the charges of the two particles and is inversely proportional to the square of the distance between them.
The constant of proportionality is called Coulomb's constant.
Mathematically, it is given as:

where k = Coulomb's constant
q = charge of first particle
Q = charge of second particle
r = distance between both particles