Answer :
The electric force between them is 0.015625 Ncm^2.
What is force?
A force is an effect that can alter an object's motion according to physics. A force can cause an object with mass to accelerate when it changes its velocity, for as when it moves away from rest. An obvious way to describe force is as a push or a pull. A force is a vector quantity since it has both magnitude and direction. It is computed using the SI unit of newton (N). F is used to represent force (formerly P).
The net force acting on an object is equal to the rate at which its momentum changes over time, according to Newton's second law in its original formulation.
Calculations:
F = Km1m2/r^2
when r= 2cm
Km1m2 = 1Ncm^2
when r = 8cm
F = 1/8*8
= 0.015625
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