[research]

hi guys
what is the difference between electrostatic field and magnetic field?

[McCoy]

hi guys
what is the difference between electrostatic field and magnetic field?

"Electrostatic fields arise from a potential difference or voltage gradient, and can exist when charge carriers, such as electrons, are stationary . Magnetic fields arise from the movement of charge carriers, i.e, from the flow of current".
former stopped by metal, later pass through most metals. etc etc etc

[Japo]

Well, voltage=potential is a mathematical abstraction defined from the observable physical reality of electric fields (force per charge unit), so it's not very kosher to define the field back around from voltage. Even though the concept of voltage has clearly understandable and useful implications when conductors are involved, e.g. circuits.

But it's true that electric fields (electrostatic) are created by and affect any electric charge, and magnetic fields are created by and affect moving charges:

http://en.wikipedia.org/wiki/Coulomb's_Law
http://en.wikipedia.org/wiki/Lorentz_force#cite_ref-Griffiths2_3-0

Faraday cages (conductor, e.g. metal enclosures) do block electric fields whereas they do not block magnetic fields in general, but they do block electromagnetic radiation (light, microwave, radio, X-rays, gamma rays). All this happens because of quasi-static equilibrium and so there's a frequency limit depending on the conductor where the free charges in it can't keep up with the speed of the radiation fields to compensate them.

http://en.wikipedia.org/wiki/Faraday_cage
http://en.wikipedia.org/wiki/Electromagnetic_field