Relative permeability Definition and 14 Threads

Why is this equation: B(D - d)/mu + Bd = mu0 N I true? B = magnetic field in the hole of the toroid D = Average diameter of the toroid d = Diameter of hole of toroid mu = relative permeability of iron, or whatever the toroid is made of mu0 = 4pi x 10^-7 N = Number of turns on the toroid I =...

So the equation is L=μoμrN^2A/l I am wanting to make μr the subject and I think this is how i do it? μr = L*l/μoN^2A However when I type in this equation i am expecting to get about 200 for the relative permeability of iron. However, i am getting like 9x10-3 which is nowhere near 200. For...

I am wondering if anybody knows how to calculate the theoretical relative permittivity of a molecule (1) using the theoretical configuration and values that are easily accessible (2). I am also wondering what the technique would be. In my pharmaceutical reaction class and also O-chem 2 we have...

Why we use relative permeability if we have absolute permeability in electromagnetism?

Homework Statement An electromagnetic wave propagates through a gas of N free electrons per unit volume. Neglecting damping, show that the index of refraction is given by n^2 = 1 - \frac{\omega_P^2}{\omega^2}, where the plasma frequency \omega_P = \sqrt{\frac{Ne^2}{\epsilon_0m_e}}.\quad(1)...

I want to know that are there any materials or methods by which their relative magnetic permeability (μr) be instantaneously,continuously & periodically varied. Kindly provide the reference document/video for the description if possible.

Homework Statement Consider the core of dimensions given in example 5-1. A coil requires an inductance of 23.6μH, a maximum current of 4A is allowed, and flux density is not to exceed 1.3T. Calculate the required relative permeability, μr, of the magnetic material that should be used. (HINT...

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...

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

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 ...

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...

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...

Consider a toroidal coil of rectangular section of N turns, for every one of which circulates a stream I. The inner radius of the coil is a and b is the exterior and the height is h. The core of this coil is a material inhomogeneous in such a way that their magnetic permeability just depends on...

Simply, all I want to know is the value of the relative permeability of lead?? Can I assume this value to 1??