I read that lower the frequency,the deeper is the skin depth in conductor.If we are using piece of thin conductor,like aluminum foil for example to shield something from electric fields,it would shield less and less the longer the wavelenght is becose skin depth keeps getting longer and since the thickness of the shield is fixed,it will block less and less energy.
My question is this,why is it possible to shield against electrostatic field if DC electrostatic field have infinite skin depth?
How can Faraday cage work? Since the shielding becomes progressively weaker the lower we go in frequency,and frequency can be infinitely low but somehow,DC electric field can be blocked,they dont possess infinite penetration,it logicaly suggest that for some reason,at some frequency,skin depth stops increasing.But that sounds like nonsense to me,I cant think of single reason why it would act like that.
What we call DC is reality extremly low frequency,true DC would need to last for infinte duration which doesnt happen in reality.When you charge HV probe for 100 seconds to test the shield its truly 0.01 Hz frequency,so it should have huge penetrating power,yet relatively thin shield can block it,why?