Why permittivity of any space is equal to permittivity of free space?
2006-08-17 05:56:25 · 6 answers · asked by star123 2 in Science & Mathematics ➔ Physics
It's about electric permittivity.
2006-08-17 06:45:38 · update #1
The permittivity of free space, and the magnetic permeability of free space, are relics of the SI system of units--a particular way of defining the unit of electric charge. Best to use "Gaussian" units wherein the permittivity and permeability of free space are both=1.
It makes the equations that much simpler. For example, in these units, the electric field of a point charge is
1/4pi*Q/r^2
ie just geometric factors times the strength of the charge. It makes Gauss's law (and the rest of the Maxwell equations) that much easier to understand.
2006-08-17 07:11:57 · answer #1 · answered by Benjamin N 4 · 0⤊ 0⤋
That is not true.
(I assume you talk about electric permittivity, epsilon.)
In air, the permittivity is so close to that of empty space that we usually ignore it. In other dielectric substances, however, there is a difference.
2006-08-17 13:39:09 · answer #2 · answered by dutch_prof 4 · 0⤊ 0⤋
Huh????????
The permittivity of free space is about 8.854*10^(-12) F/m
and any other 'space' is related to this value by the 'dielectric constant' of the material which comprises that space.
Doug
2006-08-17 13:42:14 · answer #3 · answered by doug_donaghue 7 · 1⤊ 0⤋
It means what space is permitted. Whether it is renting space, outer space, or even space bars. You have to have a special permit to have a space bar.
2006-08-17 13:04:09 · answer #4 · answered by Dallas M 2 · 0⤊ 0⤋
To me this is a nebulous concept without well enough definition.
2006-08-17 13:13:37 · answer #5 · answered by Fredrick Carley 2 · 0⤊ 0⤋
who told u that
2006-08-17 14:27:15 · answer #6 · answered by Anonymous · 0⤊ 0⤋