Permeability Definition and 126 Threads

We know Total Magnetic Flux B = B_0 + B_m Where, B_0 is the external field and B_m is the field inside a material. Now, we get, B = B_0 + μ_0*M (M is the magnetization) My question is - Do I always have to use μ_0 ? If yes then Why? The material isn't free space, is it?& also B =...

Hi to all of you, As the Biot-Savart-Law is based on experimentations in air, i like to know how to calculate the magnetic flux density in material with much greater permeability, where the circular like shape of the field distribution troughout the vicinity does not apply. Does anyone has a...

I read in class 10. I am having problem understanding magnetic fields, magnetic flux,magnetic flux density,magnetic field strength,magnetic permeability and strength of magnetic field produced due to a straight and closed loop current carrying conductor at a certain point at a certain distance...

Hi, Just wanted to know the difference between permittivity and permeability. As far as I researched, permittivity is resistance to the creation of electric field and permeability is like an allowance of a medium to the creation of a magnetic field. Is it right? I get confused because in...

So when looking at a hysteresis loop, the x-axis is the magnitude of H-field, and the y-axis is the magnitude of B-field. H is in units of electricity and B is in units of magnetic flux density. My question relates to how coercivity is determined if the material being magnetized has a...

When we talk about the permeability of free space, are we talking about something with physical meaning on its own? Or is it simply a useful constant? If it does have meaning on its own, what exactly is that meaning?

Homework Statement find the derivation of χm=μr-1 where Xm is the magnetic susceptibility and μ is the relative permeability. Homework Equations M=Xm.H M is the magnetization,H is the magnetic field μr=μ/μo where μo is the permeability of a vacuum, The Attempt at a Solution I...

Is there any way to predict an approximation for the magnetic permeability of an alloy? I imagine that getting accurate results would be near impossible without creating the alloy and then testing it, so I'm looking more for just an order of magnitude (10x) or even a tolerance of maybe ± 50% or...

It seems to me that change in permeability should not shift the equilibrium of entering and exiting ions, except how fast equilibrium is reached. Consider this: two compartments are separated by a membrane. 1st compartment holds 1mM Na+ and 10mM K+ and 2nd one holds 10mM Na+ and 1mM K+. Let's...

I have 2 interesting questions, I believe, regarding polymer properties. I am designing a ball (pretty much like a basketball in size and appearance) to be used inside pressure vessels for certain corrosive fluids. The ball is inflated with air to a certain pressure in order to cushion extreme...

If I understand correctly in refraction, photon absorption and re-emission accounts for light taking "longer" to travel. Regarding Permeability and Permittivity, the below linked website states: "permittivity affects the speed of propagation of a wave through a medium"...

I am trying to measure the relative permeability of a few materials, but the numbers I'm getting don't quite make sense. Maybe someone here can figure out what might be going wrong. My setup is as follows. I'm making solenoids using 30 AWG magnet wire wrapped around ferrite, steel and wood...

What is the difference between the two and what are the applications of them in a magnetic material?

The answer I'm hoping to achieve from this discussion is how high a field applied to air has to be in order for it's magnetic flux to match the magnetic flux of a ferrous material. As you may know, ferrous materials are used as magnetic cores, but once the applied field reaches a certain...

Hello! In the study of electric and magnetic fields, two equations are called the constitutive relations of the medium (the vacuum, for example): \mathbf{D} = \mathbf{\epsilon} \cdot \mathbf{E}\\ \mathbf{B} = \mathbf{\mu} \cdot \mathbf{H} But in a generic medium (non linear, non...

Hello everyone. I'm working on a project where I have to do a finite element simulation of low frequency magnetic coupling. But my problem is that I don't know the permeability of all the objects involved. Can anyone suggest a good way to measure the permeability of these objects ? The objects...

I am having trouble pinning down why the relative permeability of a transformer core will not directly affect the output voltage. In fact the voltage is determined by the turns ratio and is independent of mu of core material. Given this where is the flaw in the following reasoning: Induced...

I am trying to apply the law of mixtures to a clay-steel magnetic composite. To determine the optimal ratio per unit mass I need the permeability of steel and clay and the density of steel and clay. The permeability permeability of steel and the density of steel and clay is easy enough to find...

Hello. I know very few things about solid state physics, so my question is very basic.. I'm just searching for a clue.. Have some of you ever heard about, or imagine a way, of decreasing the permeability of a ferromagnetic material? Not by raising temperature, but with electric field or...

I got the following for the units of Vacuum permeability: H•m−1 A2•s-2•kg•m T•m•A-1 N•A−2 V•s•A-1•m-1 Wb•A-1•m-1 Does anyone see anything wrong with these units? Are the SI base units correct? A2·s4·kg−1·m−3 in SI base units Should it be (Amps)-2 power?

μμHomework Statement Permeability of free space: symbol: μ value: 4∏x10-7 Homework Equations How would this be input to a calculator? (4∏)x10-7 4x ∏x10-7 The Attempt at a Solution so the actual number is 1.2566x10-6 is it?

Hi Everyone, I want to know that is there anyway to relate the relative permittivity (εr) & relative permeability (μr) ?... I am having relative permittivity of an material & i want to find out its relative permeability ... Like if εr = 2.2, then μr = ?... Please reply ...

Basically I just wanted to know how magnetic fields work when a highly Permeable material is placed close to a magnet. I mean normally a magnetic field as far as I know expands out it all directions whether it is from a wire or a coil or a magnet, but what happens when a Permeable material is...

Mumetal is a high magnetic permeability alloy. It is known any kind of mechanical deformation changes its microstructure leading to loss of superior magnetic properties. Annealing of machined parts fabricated from mumetal is standard. I keep reading in literature, perhaps everyone getting...

My research is related to magnetism and I'm supposed to have a good understanding of permeability but I'm afraid I don't. My question is that how is permeability of a mater measured so that it becomes independent of the geometry and configuration? Thanks.

See attachment for my text's explanation's on the permittivity and permeability of free space, if you want but it's not necessary. Anyway, after reading those explanations of the p & p of free space I'm having a very difficult time understanding why taking the inverse square root of the product...

Hello All, I have a question regarding complex permeability and permittivity, in particular, regarding their use with the complex refractive index in Mie theory. If the material is not dielectric, the permeability/permittivity needs to be accounted for while calculating the scattering...

so what i am about to write is quite possibly wrong, but this is just how i was thinking about why the speed of light is different in a vacuum as it is in glass or water etc. i am writing this to see whether my train of thought is on the right lines, and if it isn't to hopefully get an insight...

In Hartle's book on General Relativity, page 47 footnote 1, it says: "You might be used to thinking that quantities called \epsilon_0 and \mu_0 are the basic parameters in Maxwell's equations, but \mu_0 \equiv 4\pi \times 10^{-7} is a pure number, and \epsilon_0 = 1/(c^2 \mu_0)." But as far as...

"normal" determination to estimate permeability I'm working on a magnetic circuit using a cast steel rectangular core with a .0008m air gap. There is a hint the question that says, 'Use a "normal" determination to estimate μ from the graph.' What exactly is a "normal" determination...

I've just finished reading through the generally well-written Wikipedia article on membrane potential: http://en.wikipedia.org/wiki/Membrane_potential I found almost everything to be clear, but one question is nagging at me. Why do changes in membrane permeability directly affect membrane...

Does a material's magnetic permeability affect how much of said material a magnet can lift? For example, say a magnet can lift 1 unit of weight of a material with a permeability of 2. If another material has a permeability of 4, could the same magnet instead lift 2 units of weight of this...

I'm not asking a question of what is permeability, but rather why is pi involved in its definition of 4pi x10^-7? As far as I know, pi is generally only used whenever dealing with a circle. How does the idea of magnetism relate to a circle?

I got a little confused of these three things by my teacher and Griffiths. I am acquaintanced with Feynman's lectures on physics and what I get from there is \epsilon=\epsilon_{r}\epsilon_{0} = \left(1+\chi\right)\epsilon_{0} For some reason Griffiths, as well as my teacher, likes to use...

I've always found this interesting especially because I never really knew what it means hehe. What is permeability of space? To me it sounds like the maximum speed that a wave can go through space, and space is assigned a constant for its ability in suppressing its magnitude of speed ...

Hello, What is Teflon's Magnetic Permeability? It is very close to Chloroform's Magnetic Permeability. It is not easily found in a google search or on Wikipedia or in papers. It is measured in [Henrys/Meter] and is a measure of how well a material "conducts" magnetic fields. I have...

what is the difference between permeability and dielectric constant? advanced thanks.

Negative permeability of split ring resonators(SRR) is obtained between the resonant frequency and the Plasma frequency of the SRRs, then what is the meaning 'eigenfrequency' of split ring resonator(SRR). Is eigenfrequncy is that 'frequency' at what negative permeability occur ??

Hey everyone, I've been looking at metamaterials, and it's quite an overwhelming subtopic to be introduced to. Most of the stuff I'm finding has to do with negative permeabilities. I'm wondering how exactly we control what relative permeability a material has and how fine that control is, not...

Hello All, I'm working on a project involving the use of electromagnets and I am trying to do some calculations to predict the B-Field strength of the coils I make. For the core, I'm just using some common 1/4-20 steel machine screws (the common ones you can get from Home Depot and Lowes) but...

Hi, I'm working on a presentation on Permeability. I need some basic information to start off. However, when i google permeability, all i get is magnetic permeability or permeability of the different types of soils. I'm more interested in the permeability of particles through semi porous...

Well, This is my first post, I used to read topics here, time to make one! Consider we have an oscillating magnetic field acting on a paramagnetic material, would this cause the unpaired electrons to alter their spin with the same frequency ? If so, would this affect the magnetic...

Hi, I am trying to make a electromagnet to attract a ferrous material.. Currently I am using Iron and permalloy cores for my coil electromagnets, but the residual magnetism is higher than I'd like. Is there any material with a high magnetic permeability AND low residual magnetism? Thanks...

Metal "permeability" I went to the Von Braun planetarium the other day and was surprised to find out that their planetarium dome was a prototype for the Saturn V's Fuel tank! As a result, it wasn't exactly hemi-spherical which threw off come constellations, but that's another story. I...

well i hope I am posting this in the right section, I am new here. im making some electromagnets for a personal project I am doing but i want to get all the calculations done before i get all the materials and actually build the thing. i need to know what/if there is an equation to find...

Hey everyone, I'm trying to work out the current I would require to produce a 44kOe magnetizing field in a radial solenoid. From my understanding, in order to do this I need the relative permeability of my material, the inductance of my coil, as well as the number of turns in the coil and it's...

What is permeability? I know that it's the ratio between B and H but didn't understand exactly the physical meaning of this concept

We know for sure €0 and µ0 for free space. We know as well €r and µr for material Have theses values been calculated for stand alone particles like an electron, a proton or a neutron? Have somebody then connected theses values to an atom (of hydrogen for example) which is a combination of...

A magnet is attached (or over a small airgap) to the end of an electromagnet (EM) with a steel core, then the EM is pulsed with just enough juice to get the magnet to drop off. (just negating the attraction) Which will require less energy input to get it to drop off? 1) a high permeability...

In some textbook of fundamental electromagnetism, the relation between magnetic field \vec{B} and so called magnetizing field \vec{H} is \vec{B} = \mu_0\vec{H} But later on, they introduce a so called relative permeability \mu_r = \frac{\mu}{\mu_0} I might be wrong but my...