Flux Definition and 1000 Threads

Homework Statement Very long wire carrying current I is surrounded by a brass ring of a triangular cross section. (figure attached) Show that ψ = μ° I h ------ (b - a ln ((a+b)/b) 2∏b Homework Equations A = (μ°I/2∏ * ln x) az (according to one of the solutions, where x is the...

If the radiation flux is calculated as: F = \frac{L}{2*pi*r^{2}} where L is the luminosity of the source and r is the distance from the source and the count rate of a scintillator \frac{number-of-scintillations}{time} What is the relationship between them? There obviously should be one, as...

Can anyone explain why saturation current and flux leakage are not related? saturation current = current where all the magnetic domains are aligned right? flux leakage = flux from the primary that doesn't reach the 2ndary can someone also explain why, flux leakage causes a increase in...

Homework Statement base of pyramid is a 6m x 6m square height of pyramid is 4meters. a 52 N/C E field orthogonal to the base of the pyramid Homework Equations EA cos theta The Attempt at a Solution if flux through base = EAcos theta = 52 (36m^2) cos(0) = 1872 N m^2 / C Area...

Hello. As far as I know about superconductors, if you put a superconducting material in a magnetic field and then cool that material below its critical temperature, the material should lock to that magnetic field (magnetic flux pinning). Now I have seen videos where the locked magnet/material is...

Homework Statement The second picture contains the problem statement. I am having a bit of trouble drawing the graphs asked for. Homework Equations See below The Attempt at a Solution I have drawn what I think is correct. In the first graph, I show the flux of the cart must...

Homework Statement What is the flux on a solar sail per square meter, if it orbits the Sun at 3 AU. Flux at 1 AU is 1.36 KW/square meter Homework Equations Flux goes as 1/r^2 The Attempt at a Solution Flux at 3 AU will be 1.36/3^2 = 1.36/9 = 0.15 KW/square meter I can't...

A point charge Q is located on the axis of a disk of radius R at a distance b from the plane of the disk Show that if one fourth of the electric flux from the charge passes through the disk, then R= √3 b I have looked it through all angles possible for me but it seems to evade me. Got...

Assumptions 1) a=absorption 2) f=fission 3) ∅=neutron flux 4) time independent 5) group 1, fast neutrons 6) group 2, thermal neutrons 7) All fission neutron are boring in fast group 8) All neutrons created by thermal group, thus vƩf2 exists vƩf2 does not 9) Down scattering occurs but up...

Homework Statement A proton is a distance d/2 directly above the center of a square of side d. What is the magnitude of the electric flux through the square?Homework Equations 1. Electric flux, \Phi_{net} = \oint \vec{E}\cdot d\vec{A} 2. \Phi_{net} = \frac{q_{enc}}{\epsilon_{0}} 3. \vec{E} =...

Homework Statement A horizontal rectangular surface has dimensions 3.10cm by 3.05cm and is in a uniform magnetic field that is directed at an angle of 34.5∘ above the horizontal. What must the magnitude of the magnetic field be in order to produce a flux of 4.5E-4 Wb through the surface...

Homework Statement If electric flux density (D) is given by the vector (xy,yz,xz) then calculate the displacement current density Homework Equations Jd = dD/dt The Attempt at a Solution if you differentiate D, in terms of t, then you just get 0..but that apparently isn't the answer

Homework Statement Given Xe=4.5 and E=.50 MV/m find the displacement flux densityHomework Equations D=ε0εrE εr=1+XeThe Attempt at a Solution Using the equation above I get (8.85e-12)(5.5)(.50e6)=.000024338 C/m^2 which is not what the answers say they give it in nC which I can't see how they can do?

Homework Statement Consider four point charges q1, q2, q3 and q4, located at r1, r2, r3 and r4, respectively. (a) Calculate the electric flux piercing a cube (with side a and centered at r0 = (0, 0, 0) that contains all of these charges. (b) Calculate the electric field of the four charges...

Homework Statement A closed cylinder consists of two circular end caps and a curved side. A negatively charged particle is placed outside the left end of the cylinder, on its axis. Compare the flux through the left end of the cylinder with that through the right. 2. The attempt at a...

Homework Statement A point charge q is situated a distance d/2 above a square surface of side d as shown (see attached). a) It cannot be determined b) 2q/ε0d c) q/4\piε0 d) q/\piε0d2 e) q/6ε0 Homework Equations \Phi=qenc/ε0=\ointE*dA The Attempt at a Solution Shouldn't the...

Homework Statement Consider the magnetic circuit shown in figure 3 Assuming that the core (μr=1000) has a uniform cross section of 4 cm^2, determine the flux density in the air gap the picture is very small so here are the values L=42cm, Ig=0.1cm, turns=500, and I=0.2A Homework Equations...

Hi, inductance is the property of a conductor by which a change in current in the conductor "induces" (creates) a voltage (electromotive force) in both the conductor itself (self-inductance). --wikipedia From what I understand, the inducing happens due to the resulting change in magnetic field...

Qn: A uniform electric field of strength 300 N/C at an angle of 30º with respect to the x-axis goes through a cube of sides 5 cm. (a) Calculate the flux through each cube face: Front, Back, Left, Right, Top, and Bottom. (b) Calculate the net flux through the entire surface. (c) An electron...

Homework Statement The three small spheres shown in the figure below carry charges q1 = 4.30 nC, q2 = -7.70 nC, and q3 = 3.40 nC. Find the net electric flux through each of the following closed surfaces shown in cross section in the figure. Homework Equations...

Homework Statement A cubical Gaussian surface is placed in a uniform electric field as shown in the figure to the right. The length of each edge of the cube is 1.0 m. The uniform electric field has a magnitude of 5.0 * 10^8 N/C and passes through the left and right sides of the cube...

in my notes i have.. \Phi = \int \vec{g}\cdotdA = g(4\pir2) = -\frac{GM}{r^2}(4\pir2) which yields \vec{g}=-\frac{GM}{r^2} here's what i did independently.. \Phi = \int \vec{g}\cdotdA = -\frac{GM}{r^2}(4\pir2) but since \vec{g}= -\vec{\nabla}\Phi ie... \vec{g}=\frac{d \Phi}{dr}=\frac{4...

Homework Statement I got home from a test, had an extra credit problem semi memorized and am wondering how I was suppose to solve. http://i.imgur.com/cIOdSvk.png A plane with sides L is at x=3 . An electric field E = α y^2 x i + α z^2 y j passes through (where \alpha is a constant). Find the...

Flux through sphere Homework Statement Given \vec{F}=\frac{\vec{r}}{r^2} and unit sphere, find the flux through the surface of the cube. Homework Equations Surface Integral of F dS=volume integral of Div. F d^3r The Attempt at a Solution After the above formula, I do not have...

Homework Statement The electric field intensity in polystyrene (relative permittivity 2.55) filling the space between the plates of a parallel plate capacitor is 10kV/m. The distance between the plates is 1.5mm. Calculate the surface charge density of free charge on the plates, and the surface...

Homework Statement This is a coursework problem. I am having issues understanding the concepts on this one topic - divergence and how it relates to flux. I have attached screenshots that honestly give the best representation of my issue but I will set up the issue I am having...

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...

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 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...