In physics, Impedance of free space also known as the characteristic impedance of free space is a physical constant denoted by Z0 relates the magnitude of the magnetic field and the electric field of electromagnetic radiation travelling through free space. It is expressed as the square root of the ratio of permeability of free space to the permittivity of free space.
Exact Value of Impedance
The exact value of Impedance of free space is universally accepted and defined value is-
Impedance of free space Z0 = 119.9169832 πΩ = 376.73031346177… Ω.
Formula
The Impedance of free space can be mathematically written as –
Where,
- μ0 is the permeability of free space.
- ε0 is the permittivity of free space.
- C0 is the speed of light in free space.
- H is the magnetic field strength.
- E is the electric field strength.
Z0 some time also referred to as the admittance of free space.
Hope you have understood the Impedance of free space or the characteristic impedance of free space along with value and units and the formula.
Physics Related Topics:
| Stefan-Boltzmann Constant |
| Faraday Constant |
| Gas Constant |
| Rydberg Constant |
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Frequently Asked Questions – FAQs
What is meant by impedance?
Impedance is the totality of reactance and resistance. It is fundamentally everything that curbs the flow of electric charge within a circuit. Therefore, it directly impacts the production of current through the given circuit.
What is the unit of impedance?
The unit of impedance is the ohm.
What is the impedance of free space?
The impedance of free space is a physical constant represented by Z0 relates to the value of the electric field and magnetic field if electromagnetic waves propagate through free space.
What is the permittivity of free space?
The permittivity of free space is a physical constant which has a value of 8.85 × 10-12 farad per meter (F/m).
What is an electric field?
An electric field is a physical field that surrounds electrically activated particles or bodies. It exerts a force on every other charged particle or body in the field (repelling or attracting). In other words, it can be defined as the physical field for a body of charged particles.
What is a magnetic field?
A magnetic field is a physical field that is a projection of magnetic influence on travelling charges, magnetic materials and electric currents.
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