Magnetic Shielding: Experiment Materials Available?

AI Thread Summary
Effective magnetic shielding can be achieved using conductive materials that generate currents to interfere with magnetic fields. Common options include iron ferrite and Mu-metal, which are particularly effective for low-frequency fields. While silver is suggested for its properties, its high cost and lower magnetic permeability compared to other materials make it less practical. For high-frequency shielding, a Faraday cage is recommended. Overall, Mu-metal is considered the best choice for low-frequency applications.
Gabe21
Messages
60
Reaction score
0
i am attempting an experiment and was wondering if there were any readily available materials that can effectively shield from the effects of magnetism?
 
Physics news on Phys.org
Sure, you just need a conductive material, currents will be generated that destructively interfere with the magnetic field. This is usually done with a Faraday cage around compact speakers.
 
so the ideal material would be iron ferrite?
 
I think Silver would be the most ideal at room temp
 
Why would silver be better than iron or http://en.wikipedia.org/wiki/Mu-metal" ? Not only is silver very expensive, but it's magnetic permeability is low comparatively.

If the frequencies you are trying to block are high enough then you can move to a Faraday Cage, but for low frequency fields I would think Mu-Metals would be your best bet.

I'm sure someone else who knows more can weigh in.
 
Last edited by a moderator:
This is from Griffiths' Electrodynamics, 3rd edition, page 352. I am trying to calculate the divergence of the Maxwell stress tensor. The tensor is given as ##T_{ij} =\epsilon_0 (E_iE_j-\frac 1 2 \delta_{ij} E^2)+\frac 1 {\mu_0}(B_iB_j-\frac 1 2 \delta_{ij} B^2)##. To make things easier, I just want to focus on the part with the electrical field, i.e. I want to find the divergence of ##E_{ij}=E_iE_j-\frac 1 2 \delta_{ij}E^2##. In matrix form, this tensor should look like this...
Thread 'Applying the Gauss (1835) formula for force between 2 parallel DC currents'
Please can anyone either:- (1) point me to a derivation of the perpendicular force (Fy) between two very long parallel wires carrying steady currents utilising the formula of Gauss for the force F along the line r between 2 charges? Or alternatively (2) point out where I have gone wrong in my method? I am having problems with calculating the direction and magnitude of the force as expected from modern (Biot-Savart-Maxwell-Lorentz) formula. Here is my method and results so far:- This...
Back
Top