Go Back   Physics Help Forum > High School and Pre-University Physics Help > Electricity and Magnetism

Electricity and Magnetism Electricity and Magnetism Physics Help Forum

Reply
 
LinkBack Thread Tools Display Modes
Old Jan 12th 2015, 05:47 AM   #1
Mxm
Junior Member
 
Join Date: Jan 2015
Posts: 6
Magnetic "Shielding"

Hi, I'm working on a project, interested in your opinion
Need a material for magnetic "shielding"


There must be no repulsion or attraction between M1 and S since non of them is stationary and it would affect the motion. There will be a ferromagnetic material behind S that cannot be affected by the magnet until S opens.
S should be 0.5mm thick with an opening of 1 mm

I don't think I could use diamagnetic materials since the distance between M1 and S should be 0.1 to 0.2 mm and there might be some repulsion effect.

It needs to be like in picture 2 with no repulsion/attraction between M and S
The magnetic flux must reach the recuperator (ferromagnetic so it will attract it, while S open)
Do not propose electromagnets - can't use electricity on this one

Last edited by Mxm; Jan 12th 2015 at 05:52 AM.
Mxm is offline   Reply With Quote
Old Jan 12th 2015, 09:19 AM   #2
Mxm
Junior Member
 
Join Date: Jan 2015
Posts: 6
Any Ideas?
Mxm is offline   Reply With Quote
Old Jan 12th 2015, 01:37 PM   #3
Physics Team
 
ChipB's Avatar
 
Join Date: Jun 2010
Location: Morristown, NJ USA
Posts: 2,287
I don't think you'll find the perfect material that both shields magnetic fields and is not attractive to the magnet. Iron or steel is an excellent shield, but clearly the magnet would be attracted to it. There is also a class of materials called mu-metal, which is largely nickel, though it has some iron in it as well. It makes for a good shield, and is only mildly attractive to the magnet, so perhaps that would be "good enough" for your application. See: http://en.wikipedia.org/wiki/Mu-metal
ChipB is offline   Reply With Quote
Old Jan 12th 2015, 02:06 PM   #4
Mxm
Junior Member
 
Join Date: Jan 2015
Posts: 6
Thank you for your answer, I greatly appreciate your reply
Mxm is offline   Reply With Quote
Old Jan 12th 2015, 02:49 PM   #5
MBW
Senior Member
 
MBW's Avatar
 
Join Date: Apr 2008
Location: Bedford, England
Posts: 668
Question Silly Idea?

I suspect that the thinness of your shield will be an issue, unless the magnet is really quite weak.

I admit have no idea if this is a sensible suggestion, or not,
but I will throw it in anyway...

It might be possible to get a more effective shield by layering thin foils,
perhaps foils of Mu-Metal and a diamagnetic material (eg bismuth)?

Just an idea I had, I apologise if it is total nonsense.
__________________
You have GOT to Laugh !
MBW is offline   Reply With Quote
Old Jan 12th 2015, 03:13 PM   #6
Mxm
Junior Member
 
Join Date: Jan 2015
Posts: 6
Thank you for your reply mvb,
I think it's a great idea, I am very grateful for your help
The first layer can be something like Mu-metal and just behind it a diamagnetic layer will ensure that the flux wont reach the recuperator
Thank you very much for your answers
Mxm is offline   Reply With Quote
Reply

  Physics Help Forum > High School and Pre-University Physics Help > Electricity and Magnetism

Tags
magnetic, shielding



Thread Tools
Display Modes


Similar Physics Forum Discussions
Thread Thread Starter Forum Replies Last Post
Urgent! Project for Physics Class! "Air Train" of sorts. Crystal0513 Kinematics and Dynamics 1 Sep 13th 2013 04:36 AM
Thought experiment "small box and only one body inside the universe " tesla2 Theoretical Physics 2 Jun 11th 2013 06:52 AM
Can someone explain the concept of "change in electric or magnetic flux"? khamaar Electricity and Magnetism 1 Mar 4th 2011 03:14 PM
Does "attitude" mean "orientation"? s3a Light and Optics 1 May 30th 2009 11:27 PM
"The Music" (angles, focal length, lenses, etc.) URGENT InspiRaTioN Light and Optics 0 Nov 14th 2008 10:08 PM


Facebook Twitter Google+ RSS Feed