Flux Definition and 1000 Threads

Homework Statement In a slab of Teflon (epsilon=2.1), the electric field is E= 6Ux+12Uy-20Uz V/m. Find D and P (BTW epsilon stands for the relative dielectric constant) Homework Equations Upload The Attempt at a Solution Upload

what is the connection between coloumbs , ohms and flux !

Homework Statement A point charge q is located at the corner of a cube with edges of length L. Find the electric flux through the shaded face at y = L.Homework Equations Gauss's Law; flux = ∫E\bulletn dA = qenc/ε The Attempt at a Solution Here's what I'm thinking. In the problem statement...

So I am probably understanding something wrong but would gauss's law \frac{Qinside}{\epsilon0} for a sphere surrounding an electric dipole, with a point charge just outside of the sphere. If you imagine this scenario without the outside charge, the field lines through the surface all come...

Hello! I would like to know what is the maximum flux density that can be used in a core for DC generator without taking the core in it's saturation point now a days?

Gentlemen, the the image shows 2 N48 neodymium magnets of the same volume 54 in2. On several website I can use magnetic flux density calculators to get the Br of the rectangular magnetic but haven't found one that calculates the value of the arc magnet. The Br value of the rectangular magnet is...

1. A flat rectangular coil measuring 2cm x 3cm and having 60 tuns of wire is turned through 90 degrees in 0.2s. The flux density of the magnetic field is 0.30T. Please note that a diagram is also provided - basically the coil is first perpendicular to the field, then it's rotated so as to become...

Homework Statement Hi guys, I don't really need help with answering the dollowing question but just have a quick question about it. I solved the first part of the question with an energy balance by letting q_{conduction} = q_{convection} to get the temperature of he outer...

I'm reading through these notes on numerical hydrodynamics. On pg17, they introduce the monotonized central difference flux limiter, which looks something like \frac{\partial~a}{\partial~x}|_i =...

Homework Statement Flux: a. Calculate the flux of the vector v1 = (1, 3 5) through a 2×2 square in the x-z plane (i.e., y = 0). b. Calculate the flux of the vector v2=(z, y, -x) through this rectangle:0≤ x ≤3, 0≤ y ≤ 2, z = 0.. The Attempt at a Solution I guess flux is suppose to be...

In dc motors, speed can be increased by weakening or decreasing the field flux. The mathematical explanation is --- Speed is inversely proportional to flux. But why is it so? Should not it be that when flux decreases torque decreases which is driving the motor. Now decrease in Torque should...

How much flux reaches Earth from an unobscured star? ##m_{sun} = -26.83## and ##M_{sun} = +4.74## ##m = +6## and ##M = +4.74## Calculated distance of target star: ##d = 17.86 pc## Now, here I'm trying to find the flux of a star that has the same absolute magnitude as our sun, but has an...

Hello, I am approaching the end of my multivariable/ vector analysis "Calc III" class and have a question about flux. My book states that flux, ∫∫ F \bullet N dS measures the fluid flow "across" a surface S per unit time. Now, the divergence theorem ∫∫∫ divF dV measures the "same...

Faraday's Displacement Flux Experiment: Hi, I am having trouble understanding the experiment...

Hey guys. Ok so here goes. I want to know if there is a way to calculate the flux field degaussing effect of two magnets passing by each other in repelling configuration. Like south to south. Lets say I have two magnets of neodymium N52 grade. Rockwell C scale hardness of 46. Also let's...

Hi, The Gaisser parametrization is something like: \Phi_0(E,\theta)=AE^{-\gamma}\left[ \frac{1}{1+1.1E\cos(\theta)/E_{\pi}}+\frac{0.054}{1+1.1E\cos(\theta)/E_K} \right] where A,\gamma,E_{\pi},E_K are constants. My question is: Is this saying that at higher zenith angles the flux of...

In superconductors, electrons form Cooper pairs that move at the same speed. Also, magnetic flux becomes quantized. Can someone explain in layman's terms why and how the magnetic flux becomes quantized? Especially in contrast to the magnetic flux in a conductor. Does it have something to do with...

why was maxwell given the credit to gauss's integral (flux) equation?

Homework Statement A Gaussian surface in the form of a hemisphere of radius R = 6.08 cm lies in a uniform electric field of magnitude E = 9.35 N/C. The surface encloses no net charge. At the (flat) base of the surface, the field is perpendicular to the surface and directed into the surface...

1. if the magnetic flux linking all the turns of a 50 turn coil changes from 10 mWB to 20 mWB and induces an e.m.f. of 62.5 V in the coil, calculate the time over which the flux changes. i know the formula to calculate the flux which is E = -N change in flux / change in time. to...

I am trying to resolve some long standing problems I have encountered with blackbody radiation. Namely, the derivation of the radiation energy flux equation $$J=\sigma_{B} T^4$$. I understand the derivation of the energy density of photons in "a box". $$U/V=const. T^4$$ I do not understand the...

Homework Statement r=0.10 m B=0.65 T Homework Equations ampere's law? The Attempt at a Solution

A conducting wire slides with constant speed of 1 m/s on a bent L shaped metalic rail. The angke between the wire and the rail is 45 deg and it remains constant during the whole motion of the wire. Perpendicular to the plane of the rail acts a magnetic field B=0.2 T in the X direction (Into the...

Homework Statement Let R be the region bounded by the lines y=1 , y=0 , xy=1 , and x=2 . Let \vec{F} = \begin{bmatrix} x^4 & y^2-4x^3y \end{bmatrix}^T . Calculate the outward flux of \vec{F} over the boundary of R . Homework Equations Green's theorem (normal form): \int_{\partial...

Homework Statement What is the photon flux (photons/ m2 s) at a distance of 1 km from a light source emitting 50W of radiation in the visible domain, with wavelength 6000 Angstroms. Homework Equations The Attempt at a Solution Energy of one photon = hc/λ = 3.32 x 10-19J. So, number...

Homework Statement Compute the flux of \vec{F} through z=e^{1-r^2} where \vec{F} = [x,y,2-2z]^T and r=\sqrt{x^2+y^2} . EDIT: the curve must satisfy z\geq 0 .Homework Equations Divergence theorem: \iint\limits_{\partial X} \Phi_{\vec{F}} = \iiint\limits_X \nabla\cdot\vec{F}\,dx\,dy\,dz...

Units for electric flux is Nm2/C = (electric Field Strength)(Surface Area). However the units of electric flux are confusing because I though the definition of Electric flux was The number of electric field lines through an area of surface. Therefore I though Electric flux would have had...

While I do understand the use for the displacement vector D = (e0)E + P, I don't quite understand why they label it as "flux density". The units for the displacement vector are C/m^2. The units for electric flux are Vm, so wouldn't electric flux density become Vm/m^2 = V/m which is just equal to...

Hello, As I understand, a simple transformer works by using the Input AC in the primary coil to generate magnetic field in the iron core, which then generates an AC in the secondary coil. My question is: how does this process change the voltage? I've searched for answers on other websites but I...

Hello Reader, Basically in Faraday's law, a change of flux over time induces an EMF. I was wondering why is it the enclosed magnetic flux and NOT the magnetic flux through the conductor that we consider. More specifically, I understand that the flux through a rectangular surface would be...

Homework Statement I have to control stokes theorem( I have to calculate line-and surface integral. I have a vectorfield a=(3y,xz,yz^2). And surface S is a paraboloid 2z=x^2+y^2. And it is limited by plane z=2. For line integral the line is a circle C: x^2+y^2=4 on the plane z=2. Vector n is...

Homework Statement What is the molecular flux of argon gas, molar mass 18 g/mol, with density 0.73 kg/m3 and temperature 300 K? Answer: 3.6×10^27 collisions/m^2s Homework Equations I actually have no idea The Attempt at a Solution I can't find any reference to molecular flux in my...

Hi folks First off I have only just figured out that v is used as bloody frequency in loads of astrophysics equations. Not fun. I've got monochromatic flux as: Fv = dE / dt·dA·dv now I'm happy with this. But now the lecture notes I'm looking at describes monochromatic luminosity as...

Homework Statement The charge distribution in the figure to the right is a cylindrical solid of charge q, radius R, and length H. The Gaussian surface S is a cylindrical shell with radius r and length h, with r > R. Determine the net electric flux given that q = 12Q, R = 5L, H = 6L, r does not...

We are studying electrodynamics, more specifically magnetic potential. We are given B=∇xA I saw on a certain website here http://www.ittc.ku.edu/~jstiles/220/handouts/The%20Magnetic%20Vector%20Potential.pdf that A=∇xB So is it true in general that for a vector field, the curl...

1. Problem "Estimate the flux of neutrinos passing through your body per second if the present energy density of neutrinos from the Big Bang is 0.2 MeV/m3. Assume that you are a standard size covering 0.01 m2". Homework Equations nv = Uv(T) / <Ev> The Attempt at a Solution I've assumed that...

S is a portion of a curve with r(u,v) where 0 < u < 2 and 0 < v < 2pi I'm meant to calculate Flux of the vector field F My Calculations First found dr/du then dr/dv Using the cross product, I found N = (- u cos (v) + 5 sin (v), -5 cos (v) - u sin(v), u) Then I dot product with the given...

Homework Statement The magnetic field strength at the South Pole is around 66μT, and magnetic field lines point out of the Earth perpendicular to the surface. The sled is a metal square of side 0.95 m (with non-conducting wooden slats in between). What is the magnetic flux through the sled...

Homework Statement I'm trying to figure out an equation for finding the net flux that abandons the surface of a sphere which contains a line charge distribution an a charge density. The problem is: A line charge distribution of 0.6m long with a charge density equal to 5C/m, is contained...

Hello, The energy density of an electromagnetic wave is ε_{0}E^{2}. To calculate the energy flux, at least in the derivation's I've seen, people just multiply by the speed of the wave, i.e., c. But doesn't this assume that the energy density is constant at all points?; but E changes...

EDIT: I apologize for not noticing this earlier, but I realize this should be in the HW/Coursework section of the forum. If possible, would someone be able to move it over for me? Again, sorry for my error and any trouble/confusion. I would like some help calculating the flux of neutrinos...

Hey everyone! I am struggling with the following problem: I am calculating the ratio of photons emitted to electrons generated in an LED. Due to the architecture the device shows a strong cavity effect and as such the emission profile is not lambertian but very "flat". Unfortunately I can...

Homework Statement A loop of wire in the shape of a rectangle of width w and length L and a long, straight wire carrying a current I lie on a tabletop as shown in the figure below. (a) Determine the magnetic flux through the loop due to the current I. (Use any variable stated above along...

This work was motivated by the lack of open source analytic formulas for calculating the magnetic field of a current ring at any point in space As the result of the theoretical calculations, which are based on the law of "Bio Savart Laplace", the analytical formulas giving the ability to...

Hi! When calculating the attraction/repulsion force generated by a magnetic field should I consider the flux density of both and add them to the calculation? By increasing that vector would it increase the total force generated or it has no relevance at all?

Hey Folks, I'm working on a new problem in a field I don't have much experience in at all and looking for some high level guidance to get me started. For a certain material I want to calculate how much that material ablates in the presence of steadily increasing radiation flux from the...

Hi, I'm trying to teach myself electricity and magnetism (and it's not easy!) and I'm not sure I understand flux... For one thing, why is the flux through a closed surface zero if there is no charge inside of the surface (but there IS one outside)? Another thing I'm not really sure about this...

The defination of electric flux on wiki is "is the rate of flow per unit area of the electric field. Electric flux is proportional to the number of electric field lines going through a virtual surface". If we have a cylinder in an electric field placed along its length the net electric flux...

Is we take two spherical conductors concentric with charge at centre.One of radius r then other of 2r..Will the electric flux through them will be equal? But when we use electric flux= E*A Then won't the electric flux vary as area is different of each sphere?

I am very confused about the physical meaning of the concept "flux" I am really trying to understand what it means, what unit it has, but I keep reading contradicting definitions. So, on the one hand, I read that "...flux is defined as the rate of flow of a property per unit area, which has...