Meaning of Permittivity


What does the term "permittivity" actually mean? I thought it is like permeability but my classmates say they are totally different. Aren't they both some kind of resistance presence in a medium?


Dielectric permittivity is the ability of a dielectric to store electrical potential energy under the influence of an electric field measured by the ratio of the capacitance of a condenser with the material as dielectric to its capacitance with vacuum as dielectric -- called also dielectric constant. Magnetic permeability is the ability of a material to effect the magnetic field created by an electric current, measured by the ratio of the field strength in the given material to that in a vacuum. Permeability acts in magnetic circuits somewhat analogus to conductance in electric circuits. Permittivity acts in electric circuits more like the spring constant in Hookes law in mechanics.

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