Faraday cage effect

[SaintJude]

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Can someone explain the Faraday Cage Effect Please?

I really need someone who understands this to put in their own words. Thank you.

 

[theseeker4]

Can someone explain the Faraday Cage Effect Please?

I really need someone who understands this to put in their own words. Thank you.

An electromagnetic field will induce a current in a conductor. Any electrical current will produce a surrounding electromagnetic field. In a faraday cage, the current induced produces an electromagnetic field that cancels out the external electromagnetic field inside the cage.

Not sure if this is helpful....

 

[chiddler]

http://en.wikipedia.org/wiki/File:Faraday_cage.gif

this image explained it very well for me!

 

[SaintJude]

Thanks chiddler! I think I understand now why a conducting hollow sphere will have an inner electric field that equals zero. So the outside charges are re-distributing in such a way to create a field that balances the external field. This will lead to a net electric field that equals zero.

Let me ask a question to test this concept:

What is the work required to move a charge from the left to the right within this conductor, if the amount of charge outside of the conductor is Q & say a tiny charge "q" is the only charge present within the closed conductor?

My answer: The electric field experience by q is zero & since W=Fd=qEx d. The work is zero and there will no work done in transporting the charge. 👍👎?