The force between two charged particles can be calculated using the following equation: 
where 
force in Newtons (N)
k = electrostatic constant 
charge of particle #1 in Coulombs (C) 
charge of particle #2 in Coulombs (C) 
distance between particles in meters (m)
What is the appropriate unit for k if the preceding equation is to be homogeneous in units?
Definitions:
Autism Spectrum Disorder
A range of neurodevelopmental conditions characterized by challenges with social skills, repetitive behaviors, and speech and nonverbal communication.
Aversive Conditioning
A form of behavioral training where a negative stimulus is associated with undesirable behaviors to reduce or eliminate those behaviors.
Cognitive Therapies
A group of psychotherapies that focus on changing maladaptive thinking patterns to improve emotional regulation and develop personal coping strategies.
Behavior Modification
Techniques or therapies applied to change undesirable behaviors by using the principles of learning theory.
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