Metal Sphere surrounded by dielectric

Marioqwe
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It is Example 4.5 in Griffiths intro to Electrodynamics.

A metal sphere of radius a carries a charge Q. It is surrounded, out to radius b, by linear dielectric material of permittivity epsilon ...

He goes on to say that E = P = D = 0 inside the sphere. I understand that D = 0 inside, but why is E = 0? Is the polarization of the dielectric pulling all of the charge inside the sphere to the surface? I really don't understand :(.
 
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If it's a metal sphere,where are the charges ALWAYS congregated, assuming a static situation? And why?
 

Thread 'Modeling a graph that shows age in relation to depth of an ice sample'

To solve this, I first used the units to work out that a= m* a/m, i.e. t=z/λ. This would allow you to determine the time duration within an interval section by section and then add this to the previous ones to obtain the age of the respective layer. However, this would require a constant thickness per year for each interval. However, since this is most likely not the case, my next consideration was that the age must be the integral of a 1/λ(z) function, which I cannot model.
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