Question For You Physics Guru's!!!

[SVT Cobra]

Okay so this may be a weird question but me and my friend were thinking of this and could not get the answer. I have done some research so far, but my three years of physics has escaped me in finding the answer, and it seems to lye in the realm of quantum mechanics, and possibly in the m theory (which I only know the basics of). So if anyone could give me a quick and dirty explanation of just to get an understanding. Like I said I did some research but I will just ask the original question.

You have two equations for two elementary forces, F=kqq/r^2 and F=Gmm/r^2, for electrostatic force and gravitational force respectively. Anyway both are very similar, yet due to the proportionality constants gravity is much weaker than the electrostatic force (the mystery of which may be explained by the m theory). My question is sort of two parts:

1. What exactly is k. Yes it is the permittivity of free space, or vacum permivitty, and it is something (I forget) over 4 pi episilon. Epsilon is the constant for free space...my question there in lies, can episilon change, if say the two charges acting on eachother are in water, or say butter, and what really is it? I know it has to due with the field of a sphere, but most sites do not explain it well. I believe it does change with capacitance and dialectrics, but this is just about two point charges acting on eachother in basic form.

2. So is G more than a gravitational constant? Does G also have to do with permittivty and what not, and what materials and such? This question becomes complicated because we really don't know where gravity comes from (or charge intrinsicntly also) but I was wondering if there was some more explanation behind G, or is it just a constant that was formed by experiments?

Thanks a lot for your time I appreciate any help understanding this.

 

[SVT Cobra]

up...dying for an answer so I want to keep this on the first page

 

[Analog]

Silverpig is good at this stuff.

Both formulas use the inverse square law relationship. The permittivity of a substance can change, that's how we get different dielectric constants. In low K dielectrics, we want as many voids as possible in the material to lower the dielectric constant, due to the permittivity of free space (can't get lower dielectric constant than that). The rest is up to Silverpig.

 

[Tiamat]

This should clear it up for ya

 

[SVT Cobra]

Originally posted by: Analog
Silverpig is good at this stuff.

Both formulas use the inverse square law relationship. The permittivity of a substance can change, that's how we get different dielectric constants. In low K dielectrics, we want as many voids as possible in the material to lower the dielectric constant, due to the permittivity of free space (can't get lower dielectric constant than that). The rest is up to Silverpig.

Thanks for your answer!

 

[SVT Cobra]

Originally posted by: Tiamat
This should clear it up for ya

Like I did not already do that and get lost...

 

[Tiamat]

Originally posted by: SVT Cobra

Originally posted by: Tiamat
This should clear it up for ya

Like I did not already do that and get lost...

Oh, my apologies, it helped me remember what it was

My work only deals in high vacuum, so many things are simplified. In real world, you have problems.

G is interesting, wikipedia has some history behind it and its very difficult measurement.

Text

You might get more attn if you posted also in highly technical as the explanation you seek is a bit higher than freshman level physics (what I have)

 

[SVT Cobra]

Originally posted by: Tiamat

Originally posted by: SVT Cobra

Originally posted by: Tiamat
This should clear it up for ya

Like I did not already do that and get lost...

Oh, my apologies, it helped me remember what it was

My work only deals in high vacuum, so many things are simplified. In real world, you have problems.

G is interesting, wikipedia has some history behind it and its very difficult measurement.

Text

You might get more attn if you posted also in highly technical as the explanation you seek is a bit higher than freshman level physics (what I have)

Thanks a lot for your help!

 

[Born2bwire]

\epsilon_0 is the permittivity of free space and one way of thinking about is it is the capacitance of vacuum. Permittivity relates the electric field with the Electric Flux Density (Electric Displacement Field). This quantity contains the effect of the electric field in a background vacuum and the polarization of the bound charges in the medium. When an electric field is applied in a medium, the various molecules, bound charges, etc. will align with the field inducing local dipole moments. The sum effect of all these induced dipoles reinforces the electric field in what is called polarization. So the effect of the polarization due to induced dipoles in a dielectric plus the inherent capacitance of free space gives rise to the electric flux density that is related to the electric field by the permittivity. Permittivity is not a constant, it varies between different types of materials and it is not constant over frequencies. A dispersive medium is one where the permittivity (and/or the permeability) is dependent upon the frequency of the excited fields. The permittivity is a complex number, the imaginary part of the permittivity retains the conductive properties of the material. A purely real permittivity (and purely real permeability) denotes a lossless medium.