Flux Definition and 1000 Threads

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...

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...

Homework Statement The total magnetic field intensity at the location of Edmonton was 57652 nT on March 20, 2012, when I first wrote this question. Now, on Feb. 19, 2013, it is 57569 nT. The magnetic inclination is +75 degrees (i.e., it points downward at an angle of 75 degrees with respect to...

Homework Statement Compute the flux of \overrightarrow{F}(x,y) = (-y,x) from left to right across the curve that is the image of the path \overrightarrow{\gamma} : [0, \pi /2] \rightarrow \mathbb{R}^2, t \mapsto (t\cos(t), t\sin(t)). A (2-space) graph was actually given, and the problem...

Homework Statement A point charge +Q is placed at the center of a cube. What is the electric flux through a face of the cube? Homework Equations Flux = Q/ε The Attempt at a Solution The answer is Q/(4ε), but I thought it should be Q/(6ε) which isn't even an option. I'm I crazy? Since there...

Homework Statement gas impingement flux density is given by ∅=P/\sqrt{}2mkT where m- mass of a molecule show that ∅=3.513*1022P/\sqrt{}MT where pressure in torr and M-molar mass of molecule then ∅ in molecules per cm2 per second Homework Equations ∅=3.513*1022P/\sqrt{}MT...

Given is vector field \overrightarrow{C}(\overrightarrow{r})=r calculate flux \Phi =\int_{S} \overrightarrow{C}\cdot d\overrightarrow{A} through sphere S with beginning in [0,0,0] and r=1

Homework Statement In homogeneous magnetic field the magnetic flux density vector is B = (0, 5T)ez (ez is unit vector in z direction). There is a sphere of radius R = 2cm with its centre at the origin. Find the flux crossing that half of the sphere surface for which z larger or equal to 0...

what is the difference between luminosity, Intensity and flux in particle physics? Some time people use them in similar meanings.

[b]1. The problem statement, all variables and given/known dat Say I have a closed surface is the flux across this closed surface only zero if the force originates from inside the surface? What about if it originates outside the closed surface and can penetrate through the closed surface...

Homework Statement Let F(x,y,z)= a^2 xi+(y/a)j +az^2k and let sigma be the sphere of radius 1, centered at the origin and oriented outward. Find all values of a such that the flux of F across sigma is 10. Homework Equations Stokes Theorem Gauss's Theorem...

[b]1. The flux of a conserved quantity can be written q(x) = -x2 (du/dx)-u If the source term is f(x) = x, write the strong form of the conservation law. I know the form of the strong form is : d/dx(c du/dx)+f(x)=0 I have no idea where to begin for this problem. The examples my professor gave...

1. A loop of wire has the shape shown in the drawing. The top part of the wire is bent into a semicircle of radius . The normal to the plane of the loop is parallel to a constant magnetic field of magnitude 0.75 T. What is the change in the magnetic flux that passes through the loop when...

Homework Statement An infinite line of charge is along the entire x-axis has a constant value for λ. A hemisphere is centered at the origin and has a base circle of radius a. What is the electric flux throught the hemisphere Homework Equations Flux = Q enclosed / ε The Attempt at a...

Homework Statement In a region of space there is an electirc field E that is in the z-direction and that has magnitude E=(964 N/(c*m))x. FInd the flux for this field through a square in the xy-plane at z=0 and with side length .350 m. One side of teh square is along the + x-axis and another...

Hey. So if I have a condenser, where the electric field between the plates is equivalent to 50kV/m, the electric flux density D= ε0*50kV/m. If I insert a dielectic between the plates, the electric field will decrease to 10kV/m, and kappa (the relative permittivity) equals 5. So, will the flux...

Let's say there is a cube sitting in the first octant. Our F(x,y,z): <ax , by, cz> and Each face of the cube is oriented to outward pointing normal. Can I just calculate the the flux of one face and then multiply this by the number of faces to get the total flux? Will flux in a cube always be...

Homework Statement A hemispherical surface with radius e in a region of uniform electric field E has its axis aligned parallel to the direction of the field. Calculate the flux through the surface? Homework Equations Flux = E A cos β The Attempt at a Solution Why can't we say...

Homework Statement Hello, the problem I am working on is: Assume the magnitude of the electric field on each face of the cube of edge L = 1.05 m in the figure below is uniform and the directions of the fields on each face are as indicated. (Take E1 = 31.5 N/C and E2 = 26.5 N/C.) (a) Find...

Homework Statement There is a half space z>0 full with hydrogen gas with density n atoms / metres cube. An incident wave plane with pulsation ω coming from z = -∞ arrives at the surface of incidence. This wave transports a flux of energy ∅0 at z=0. We consider a elementary cylinder whose axe...

I have two parallel air coils attached to each other but separated by 3" of air. if I move a magnet past one coil it will induce a magnetic flux into it and that will create a voltage across it. Will that voltage transfer to the other coil thereby creating a magnetic pulse in the second coil...

Homework Statement Twelve infinite long wires of uniform linear charge density (λ) are passing along the twelve edges of a cube. Find electric flux through any face of cube. (see attachment)Homework Equations The Attempt at a Solution I have actually solved the problem but I think there's a...

Homework Statement An insulating sphere of radius R has positive charge uniformly distributed throughout its volume. The volume charge density (i.e., the charge per volume) is ρ. What is the flux through a Gaussian spherical shell of radius R/2 that is totally contained inside the charged...

Homework Statement a cylindrical solid of charge q, radius R, and length H. The Gaussian surface S is a cylindrical shell of radius r and length h, with r < R. Determine the net electric flux given that q = -48Q, R = 4L, H = 3L, r = 2L, and h = 2L (type the integer value, along with the sign...

Homework Statement A particle with charge Q is located immediately above the center of the flat face of a hemisphere of radius R as shown in the figure below. (a) What is the electric flux through the curved surface? (Use any variable or symbol stated above along with the following as...

Homework Statement Consider a uniformly charged sphere (an insulating sphere of radius R,) and a spherical Gaussian surface with radius R/2 concentric to the sphere. What is the total flux flowing through the Gaussian surface? Homework Equations Vsphere= (4∏R^3)/3 Asphere= 4∏R^2 Gauss' Law...

Homework Statement The elctric field in a certain region of space has components Ex = 6.0 N/C, Ey = 7.0 N/C, and Ez = 0. Find the electric flux though the surface x = 6y, 0 < x < 6.0 m, 0 < z < 1.0 m. What is the angle between the electric field and the unit vector normal to the...

Homework Statement A small disc or radius R with surface normal ˆ k is placed a distance z from a point charge −q,( k hat pointing along the z-axis which goes through the charge and the center of the disk.) Assuming that R ≪ z, derive an expression for the electric flux ΦE passing through...

An E field exists in a region of space and it can be described by: \bar{E} = \hat{i}xy^2 Calculate the flux through a cube of size 1.0m, with one end extending into the positive x,y and z directions. Find the charge enclosed. I have no idea how to start this? can someone point me in...