Electric constant (vacuum permeability)
Try it yourself:
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electricConstant
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The electricConstant, also called vacuum permittivity, relates electric fields, charge, and capacitance in SI electromagnetic equations.
Use it with coulomb and magneticConstant. Material permittivity differs from the vacuum constant, so apply relative permittivity when appropriate.
Enter electricConstant on a calculator line to see its built-in value, or place the name inside a longer expression. Keep any displayed unit attached when converting or combining physical quantities, and check that every other value uses a compatible dimension.
The example above is editable, so you can replace surrounding values and test the constant in your own formula. Browse all constants to compare related values and notation.