What Happens to Metal Boxes in Magnetic Fields?

[Jahnavi]

Homework Statement

Homework Equations

The Attempt at a Solution

I have honestly no idea about this concept . Book doesn't mention anything about this . This looks similar to Faraday cage in electrostatics . But I don't understand how this works in case of magnetic fields .

Is this related to eddy currents or high permeability of metal ?

 

[scottdave]

Looking up Lenz's Law may help you with this one. Here is the Wikipedia article: https://en.wikipedia.org/wiki/Lenz's_law

Also, look up what the magnetic permeability for copper is. https://en.wikipedia.org/wiki/Permeability_(electromagnetism)

 

[Jahnavi]

Sorry . I can't see how the above two play a role . Could you explain .

 

[rude man]

The hint I can give you is Eddy currents.
Once you look up the permeability of copper you will realize that there is no high-permeability shielding involved. But by faraday, a time-changing B field induces currents which will set up their own B fields. Combine this fact with what scottdave hinted about Lenz's laws and you should be able to come up with an idea.

 

[Jahnavi]

Thanks !