What is this constant (regarding electrostatics)

AI Thread Summary
The discussion centers on the symbol εo, which represents the permittivity of free space or vacuum in electrostatics. It is crucial for understanding the behavior of electric fields and forces between charged particles. The context involves a theoretical scenario where an electron orbits a stationary proton, and the focus is on calculating the kinetic energy of this system. The permittivity constant plays a significant role in determining the electrostatic forces at play. Understanding εo is essential for solving problems related to electrostatic interactions.
NP04
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Homework Statement
Suppose that an electron could orbit a proton in a circular orbit of constant radius R. Assuming that the proton is stationary and only electrostatic forces act on the particles, which of the following represents the kinetic energy of the two particle system?
Relevant Equations
n/a
Screen Shot 2019-05-21 at 8.00.05 PM.png


1.png

My only question is what the εo symbol represents.
 
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NP04 said:
Problem Statement: Suppose that an electron could orbit a proton in a circular orbit of constant radius R. Assuming that the proton is stationary and only electrostatic forces act on the particles, which of the following represents the kinetic energy of the two particle system?
Relevant Equations: n/a

My only question is what the εo symbol represents.
The permittivity of free space/vacuum:

https://en.wikipedia.org/wiki/Permittivity
 
Thanks!
 
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