Question
Fri March 11, 2011 By:

what is permitivity of free space

Expert Reply
Sat March 12, 2011
Dear student

In electromagnetism, permittivity is the measure of how much resistance is encountered when forming an electric field in a medium. In other words, permittivity is a measure of how an electric field affects, and is affected by, a dielectric medium. Permittivity is determined by the ability of a material to polarize in response to the field, and thereby reduce the total electric field inside the material. Thus, permittivity relates to a material's ability to transmit (or "permit") an electric field.

It is directly related to electric susceptibility, which is a measure of how easily a dielectric polarizes in response to an electric field.

In SI units, permittivity ε is measured in farads per meter (F/m); electric susceptibility χ is dimensionless. They are related to each other through

 

where εr is the relative permittivity of the material, and ε0 = 8.85… × 10−12 F/m is the vacuum permittivity.

 Hope this helps

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