Represent constant as symbol instead of Entity?

Questions
1

Good day,

I am using the constant “ElectricConstant”. in my formula:
Screenshot2021-09-19113305.png

I would rather express it as the symbolic \epsilon_0. Is this possible? Pi is a constant and that is represented in symbolic form.

Could you please advise me how?

Kind regards,
Connor

2

This will give you the Form representation of the entity:

Entity["PhysicalConstant", "ElectricConstant"]

This will give you the Symbol associated with it:

Entity["PhysicalConstant", "ElectricConstant"]["Symbol"]

You can do this:

1/(4 Pi Sqrt[x^2 + y^2 + z^2] Entity["PhysicalConstant", "ElectricConstant"]["Symbol"])

or, you can just use the symbols as input–check out “Basic Math Assistant” under the Palettes menu.