Answer:
Definition of Coulomb's Law: The force of attraction or repulsion acting along a straight line between two electric charges is directly proportional to the product of the charges and inversely to the square of the distance between them .
Step-by-step explanation:
Let F be the force of attraction between two charges q1& q2 which are separated by a distance r then the force is directly proportional to the product of charges and inversely proportional to the square of the distance between them . Symbolically
F ∝ q1q2--------1
F∝ 1/r²-----------2
Combing 1 and 2
F ∝ q1q2/r²
or
F = k q1 q2/r²
Where k is the Coulomb's Constant and its value is 9.0 x 109 N • m² / C².
F = electric force
k = Coulomb constant
q1, q2 = charges
r = distance of separation