Flux Definition and 1000 Threads

Homework Statement F(x,y,z) = x^3zi + y^3zj + xyk across the surface x^2 + y^2 + z^2 = 9Homework Equations See attached imageThe Attempt at a Solution See attached image. I'm fairly certain there's either something wrong with my initial integral, also I don't think I integrated correctly with...

Hello Everyone. I am working on a DC-DC converter design which uses a transformer with an additional inductive element on the secondary side. The coil charges a large capacitor. Since there is an additional inductive element on the secondary side the inductive element builds up a field...

Homework Statement A uniform electric field of magnitude 6.5 \frac{N}{C} passes through a circle of radius 12 cm. What is the electric flux through the circle when its face is perpendicular to the field lines. The Attempt at a Solution The only problem with this question is picturing the...

Homework Statement 1) A small disc of radius R with surface normal ##\hat{k}## is placed a distance z from a point charge −q. Assuming that R ≪ z, derive an expression for the electric flux ##\Phi_E## passing through the disc. 2) Twenty-seven drops of salt water with the same radius are each...

QUESTION A star of bolometric luminosity L at a distance r will exhibit a bolometric energy flux F given by F = L/4πr2 in the absence of obscurity. A. Assume that all stars have the same bolometric luminosity L and that stars are uniformly distributed in space with a number density n...

https://www.smartphysics.com/Content/Media/Images/EM/03/h3_lineD.png In the image above, i was asked to find the electric field at point P. since the y-components cancel due to symmetry, i used he equation \Phi=\intE dA=Qenclosed/\epsilon . I found q1 and q2 by multiplying (charge density x...

what is flux...?? is it a scalar or a vector and difference bet flux and flux density i have read the articles where the flux (either in case of electric flux or magnetic )is described as the no of lines passing through a surface area ( open in case of magnetic characterized by boundary and...

Homework Statement \vec{F}=(4x, 3y, 0) Find the flux over the part of the sphere centered at (0, 0, 0) with radius 4 between the planes z=-1.19 and z=0.87. The Attempt at a Solution \hat{N}=(x, y, z)/4 \int\int_{S}(4x, 3y, 0)\bullet([(x, y, z)/4])dxdy 0.25\int\int_{S}(4x^2+3y^2)dxdy The issue...

Gauss equations state that the flux of a gaussian surface is equal to the sum of all the electric field times the surface area. Although he stated this in theory, how was he able to prove it possible. What measuring device do people use to prove that this theory is correct?

Am I understand correct that when an air coil pass through magnetic flux, it create current and emf? power = IV If turns increase, do I get more power? why? If power changes, then how to get out max power.

A friend of mine told me that in order for Back-EMF to be generated, The flux lines has to be parallel. Is that true? This question is based on a electromagnet - magnet set up. The flux lines must be parallel? At least C-EMF can be generated but if the flux lines are perpendicular it will...

Find the net electrical flux through a closed sphere of radius R in a uniform electric field I know that the flux is going to be 0 since there is no charge enclosed, but how would I show this mathematically? The next half of the question asks about a cylinder with sides parallel to the electric...

a type II superconductor may not exhibit complete exclusion of magnetic field due to quantum vortices. It is my understanding that the magnetic field present will affect the number of vortices or fluxons present, but what is the relationship between magnetic field, and number of vortices in a...

Hi, I have read a lot about Diffusion Equation and solving neutron flux problems in different mediums, planes and groups, but I can't grasp this topic. In other words, I don't know why they mention: 1. Infinite/finite medium 2. Homogeneous/non-Homogenous medium 3. One/two or multi-group...

Homework Statement I've attached an image with the entire question. Homework Equations Attached an image with relevant equations. Can't use Gauss' Divergence The Attempt at a Solution In the attached image I've also included the start of my calculations, I just need to see if my...

Homework Statement https://www.smartphysics.com/Content/Media/Images/EM/03/h3_lineD.png Where, λ1 = -3.2 μC/cm, λ2 = 9.6 μC/cm, a = 8.5 cm and h = 11.4 cm. a/2 = 4.25 cm. What is the total flux that passes through the surface of the cylinder? Homework Equations E = 2kλ/r \Phi...

Hey Folks, I am a third year electrical engineering student and just want to clarify a concept involving electromagnetics/transformers. When supplying magnetization current to a transformer (assume sinusoidal), this induces a time changing magnetic flux in the core. The time changing magnetic...

Hi everybody, first time poster here. I am working on calculating the force of magnets in a 3 dimensional space. I have found a formula for the magnetic flux density at a distance z from the magnet face at this link http://www.magneticsolutions.com.au/magnet-formula.html, under Flux density at...

Homework Statement A star as an apparent visual magnitude of 14 and an absolute visual magnitude of 14.7. I have worked out that its distance is 7 parsecs. The sun has an absolute visual magnitude of 4.8 and an effective temperature of 5800k. If the star has the same effective temperature of...

On pp. 459 of Dark Sun: The Making of the Hydrogen Bomb Richard Rhodes writes: He is talking about soft-x-rays in that quote. I understand that X-rays are massless so their weight is zero regardless of the density of the flux. Is this not correct? Is there a better comparison he could have...

Hi How do you get a photon flux per unit wavelength curve for solar radiation? My understanding of "per unit wavelength" is that the wavelengths within a very short range are fired at a detector. The range is then gradually changed to cover higher wavelengths. The values of flux measured by...

eletric flux and charge have same units ie coloumb is it a coincidence or some similarity exists btw these two? electric flux density D= εE is used for calculating flux ψ not E .why?(read tht it is done for practical reasons) please explain the practical reasons ,if any.

Why is it that the air gap flux density is flat topped at no load. What happens to it's shape when machine is loaded?

Hello people, I think the problem what I have is well known in experimental physics. Hope, somebody can helps me, thanks in advance. Here is: There is a source of neutrons with a flux of λ neutrons per minute, which you do not know and want to estimate. You open the detector for one minute...

I know that the electric flux is a scalar quantity, but the concept of the Electric flux seems to confused me. If the electric flux density is a vector quantity, how come the electric flux is a scalar quantity? For example, I have the electric flux density: D=20i+2j. Isn't it means...

How to calculate the visual magnitude of a star having only the flux of such star? The equation involves 2 magnitudes and 2 fluxes, corresponding to 2 objects a and b: ma-mb= -2.5log10\left( \frac{F_a}{F_b}\right) but I just have Fa and I have to obtain ma. Is it valid to take...

are both of the equations i posted flux equations. one of them is for a surface of a solid and the other is for a curve?

Homework Statement Homework Equations I know that flux is ∫∫F[r(t,s)]dotted[∂r/∂s x ∂r/∂t]dtds The Attempt at a Solution So I parameterized the equation y=x^2+z^2 as: x = s y = s^2 + t^2 z = t r(t,s) = [s, s^2+t^2, t] I take the partial derivative of r with respect to s and t and then...

Hi, I think my problem may be a little trivial however I have been stuck on it for quite some time. I have plots of flux density (Jy) versus wavelength in order to look at a particular forbidden line. I want to find the luminosity of the line, however as I am dealing with Jy [W/(m^2 Hz)] I do...

The Question A single phase transformer has the following rating: 120 kVA, 2000 V/100 V, 60 Hz with 1000 primary turns. Determine: (A) the secondary number of turns (B) the rated currents on the primary and secondary (C) The maximum flux (D) given a maximum flux density of 0.25 T, the...

hi there! I have a bit stupid question: Imagine a solid metal cylinder. We put a . Explain to me please the exact model of the direct current electric flux of the particles. Is there a "skin effect" when a direct current is in action ?

Referring to following links, I would like to know whether Solar Radio is equal to Radio Flux or not, it seems that it describes Solar Radio in different format. Are they monitoring the same objects? Does anyone have any suggestions on what the different is between them? Thanks in...

Magnetic suspension and levitation is the caused by the flux trapping effect in superconductors.How does this flux get "trapped"? Another quick question- We link a magnet to a superconductor by bringing it very close to one ,until both of them start attracting and repelling. My question is...

Magnetic suspension and levitation is the caused by the flux trapping effect in superconductors.How does this flux get "trapped"? Another quick question- We link a magnet to a superconductor by bringing it very close to one ,until both of them start attracting and repelling. My question is...

I have an electromagnetic field with a Poynting vector that has the following form in spherical coordinates: $$\bar{P}(R,\phi,\theta)=\frac{f(\phi,\theta)}{R^2}\bar{e}_{r}$$ The exact nature of f(\phi,\theta) is not known. Suppose I measure the flux of this vector field by a flat area...

hey all, i've recently started studying electrostatics, and i have couple of question about things that i did not fully understand, and would very much appreciate if someone could set me straight. 1) how can a cube, with a single charge in the middle of it have a flux? don't the field lines...

Referring to following link about Solar Radio Flux, I would like to know more about Solar Radio Flux, is Solar Radio Flux different from Electric Flux? What is the major difference in term of properties of their fluxs? Does anyone have any suggested materials on what Solar Radio Flux is about...

Hello everyone. I am trying to translate the flux of a source observed by a telescope, in different units. In my case, I have the flux equal to counts/cm^2/sec in a given energy band (15-50 keV) and I want to translate this information in erg/cm^2/sec, in the same energy band Here you can...

http://www.xtremepapers.com/papers/CIE/Cambridge%20International%20A%20and%20AS%20Level/Physics%20%289702%29/9702_s05_qp_4.pdfHomework Statement 6b Homework Equations flux linkage = BA B=F/iL The Attempt at a Solution from my understanding, if B=F/iL , if the current is zero...

Homework Statement Consider a cylindrical vessel with cross-sectional area 1m^2 Derive the particle flux (1/4n\bar{v})Homework Equations I have the solid angle: \Omega = 2π(1-cosθ) The Attempt at a Solution I'm assuming that the solid angle represents the full area that the particles can...

Homework Statement Evaluate the surface integral \int_{S} \int \vec{F} \cdot \vec{n}\,dSwith the vector field \vec{F⃗}=zx\vec{i}+xy\vec{j}+yz\vec{k} . S is the closed surface composed of a portion of the cylinder x^2 + y^2 = R^2 that lies in the first octant, and portions of the planes...

The work done so far https://www.dropbox.com/s/qmfidqot3nttlw5/phpQd8GGH.png https://www.dropbox.com/s/xn4t5m2aleopwy7/phpldZ0KX.png Is the answer correct...

Deaar all good morning I am very interested to the flux in a slab of extrapolated thickness a, containing distributed sources of neutron. A I have an example in which the source is given as s(x)=S(x+a/2) where S is a constant and x distance from the center of the slab. You mentioned in one...

Homework Statement Im starting to read about the electric flux and gauss's law. I am reading two books, Serway and Schaums electromagnetics. The weird thing is that I'm getting different equations for the electric flux Serway says that the Electric flux ψ is ∫E ds = 1/ε ∫ρ dv =...

We define flux density as D= ε E right? or even ∇.D=ρ But I can't link the above with what is given in the wiki where they have used the symbol "phi" http://en.wikipedia.org/wiki/Electric_flux What is the difference between D and symbol "phi"? I would be really happy if you could...

Homework Statement Water enters a kidney through a tube at 10 mL/min. It exits through a 6-mm-diameter tube at 20 mm/s.What is the rate of change of mass of water in the kidney? Homework Equations m=vpa q=va After conversions to meters V=.02 Q=.000167 A=(pi/4)*.006^2 = .0000282...

The dominant energy condition is interpreted as meaning that no observer will see a flux of energy flowing at speeds greater than c. In this post I'm basically asking how to relate this concept of "speed of the energy flux" more precisely to the stress-energy tensor. If we start with dust...

Homework Statement Given a vector field A=(2x,-z^2,3xy), find the flux of A through a surface defined by ρ =2, 0<\phi<\pi/2, 0<z<1 Homework Equations ∇\bulletA? The Attempt at a Solution Can I use divergence method here? This is a closed surface correct? A cylindrical...

Homework Statement If vector A=(2x,-z^2,3xy), find the flux of A through a surface defined by ρ =2, 0<\phi<\pi/2, 0<z<1 Homework Equations divA? The Attempt at a Solution Can I use divergence here? This is a closed surface correct? Is this is a cylindrical wedge? Also do I need to...

Homework Statement http://smartphysics.com/Content/Media/Images/EM/03/h3_lineD.png charge density 1 = .00029 C/m charge density 2 = -.00087 C/m h = .116 m a = .094 m a) What is the total flux Φ that now passes through the cylindrical surface of height h=.116 m? Enter a positive number if...