Flux Definition and 1000 Threads

Homework Statement Through what closed, oriented surface in R^3 does the vector field F = <(4x + 2zx^3), -y(x^2 + z^2), -(3x^2z^2 + 4y^2z)> have the greatest flux? Homework Equations Flux = double int F.ds Gauss theorem perhaps (double int F.ds = triple int(DivF)dV) The Attempt at a...

The electric flux around a charge is represented by electric lines of force. But it is said that the electric lines of force is purely an imaginary concept to visualize a field. In the Gauss' law, using the formula q/epsilon we calculate the total number of lines of force. For a charge of 1...

Homework Statement The electric field has been measured to be horizontal and to the right everywhere on the closed box shown in the figure. All over the left side of the box E1 = 90 V/m, and all over the right, slanting, side of the box E2 = 400 V/m. On the top the average field is E3 = 120...

Homework Statement A region of space around the origin contains an electric field E = 2.0i − 3.0 j. Such a field cannot exist in empty space. Find the total charge within a cube of side a = 0.5m centered on the origin, with its six faces possessing normals in the six cardinal directions...

Hi everybody. Apologies for asking what may be a very simple question, but in every textbook I've read, they say that the net flux through an area dA from an isotropic emitter is zero. But it also says that the sun is an isotropic emitter. Now hold on, the net flux from the sun is clearly...

Homework Statement A star has a photospheric temperature of 5000 K, a radius of 0.9Ro, (Ro = radius of sun). If the star is 20 pc away, calculate the monochromatic flux (In Wm^2micron^-1) at 500 nm, measured at Earth. Calculated the surface area to be 1.6416*10^18 m^2.Homework Equations We...

Homework Statement A point charge is placed at the origin. Calculate the electric flux through the open hemispherical surface :(x-a)2 +y2 + z2 = a2 x> or = a. Homework Equations The Attempt at a Solution There is no diagram but this is how i visualised the question(please refer...

CHF(critical heat flux), MCHFR(minimum critical heat flux ratio) how we will find the MCHFR for vs time for coast down transient by drawing channel operating channel and CHF setpoint curves for several time? I really confused about this can you help me about it

Hi all ! I'm looking around the net to find good resources on how to compute total radiation flux from a given star at a given orbiting distance. Ideally I'd like to get not just the W/m2 of the star, but also the expected high-energy radiation, thermal, solar wind pressure.. well, the...

Whats the Concept behind "change of electric/magnetic flux"? What i mean to say is that, i understand the concept of "change of distance", "change of time" and other changes and other time rates... but the "time rate of change of electric flux" really confuses me. Does change of flux mean...

I am building an axial flux generator with dual rotor and single stator. I was doing calculations and have a magnet pole pair question i need help with, there are 12 magnets on each rotor with North pole on one rotor across from South pole on the other rotor. Since there are 24 total magnets...

1. A current loop with a resistance R = 522 and an area A = 0.28 m2 is oriented perpendicular to a magnetic field that varies in time as sketched in the figure. What is the current induced in the loop at t = 0.30 s...

According to the faraday's law,the induced emf is proportional to the magnetic flux change linking the conductor.However,I wonder why there is induced emf when conductor is moving in uniform magnetic field,because i think that the magnetic flux linking to it is always the same as it move in...

your all wrong sorry quantum theory is good but but pratical is better gravitons are last century interons and quantum flux are now just think of how your math is constant and never varies then think how math is basic enough to make you move farther than you ever dreamed

Difference between Electric flux density,electric field strength... I want to know the difference between,electric flux density and electric field strength.Are they the same? And also,there is a magnetic field(measured in Tesla),magnetic flux(in Weber),magnetic flux density(Weber per...

Homework Statement A cubic cardboard box of side a = 0.440 m is placed so that its edges are parallel to the coordinate axes, as shown in the figure. There is NO net electric charge inside the box, but the space in and around the box is filled with a nonuniform electric field of the...

Homework Statement The Sun is lower in the sky during the winter than it is during the summer. How does this change affect the flux of sunlight hitting a given area on the surface of Earth? How does this change affect the weather? (I take it I'm supposed to consider the sun to have a...

Homework Statement My book says Now here is the thing I have two situations (1) Consider a hollow conducting sphere with a net charge +Q and a conducting solid sphere with a net charge -Q. The solid one is inside the hollow conducting sphere. If I were to construct a Gaussian...

Homework Statement (a) Calculate the electric flux through the hemispherical surface shown in the figure. (The surface is an open shell, with no bottom.) The electric field is uniform: E = E0 khat. (b) If the electric field is instead E = E0 ihat, what is the flux? Homework Equations...

Homework Statement Calculate the surface flux integral of F = 2xy xhat + (xz - 5xy2)zhat over the surface shown in the figure. Take n = k. See Figure Homework Equations Flux = Integral (Electric Field * dA) The Attempt at a Solution So from the figure the total area is obviously a2...

Hello, I'm having trouble getting started on this problem. Here's the question: [PLAIN]http://img810.imageshack.us/img810/2464/ee323assn3q3.jpg My issue is in setting up the governing partial differential equation in 3 dimensions. What I've tried so far is setting du/dt equal to the...

I am having a hard time understanding the reasoning behind my answers on this physics homework. We are currently practicing electric flux (without Gauss Laws) and the answer I got was correct, I just do not understand how I got it. The question is... "The four faces of a tetrahedral pyramid...

Hi. I've been reading PF for quite a while and have decided to ask my first question. Please be gentle. (I'm a retired computer programmer, not a student)... I've been learning Gauss' divergence theorem and I understand what "flux density" is when considering things like fluid transport or...

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. https://www.webassign.net/serpop/p19-33.gif (a) What is the electric flux through the curved surface? (Use any variable or...

I am taking a course in Electromagnetic Wave Theory, and the prescribed book for us is Engineering Electromagnetics by William Hayt. The book if excellent, till I reached the part about Gauss's Law. I will be describing my queries here, kindly help me out with them. 1) The book first states...

Homework Statement Two monoenergetic neutron beams I1=2*10^10 and I2=1*10^10 intersect at an angle of 30 degrees. Calculate both the flux and current in the region where they intersect. Homework Equations The Attempt at a Solution I lined the first I1 up parallel to the x-axis...

I under stand that electric flux is proportional to the charged enclosed but I don't get why. Homework Statement Consider the sphere with the charged enclosed: [PLAIN]http://electron9.phys.utk.edu/phys136d/modules/m4/images/Image985a.gif As you can see the area and electric field...

The Power density (Pd in W/m^2) at a distance r (in meters) for a transmitting antenna with gain Gt is given by: Pd = ( Pt * Gt) / 4 * Pi * r^2 where Pt (in Watts) is the power transmitted from the antenna. All these variables are scalar values so if there were multiple antennas and...

Homework Statement A surface in the shape of a cube with edge lengths a = 2.7 m is oriented in an x-y-z coordinate system so that the top and bottom faces are parallel to the x-y plane, the left and right faces are parallel to the x-z plane, and the front and back faces are parallel to the y-z...

Homework Statement You measure an electric field E at a distance x from a point charge. What is the electric flux through a sphere whose center is at that distance and whose radius is less than x from the charge? Homework Equations E*dA = (q_enc)/(e_0) The Attempt at a Solution I'm...

Homework Statement Find the net electric flux through the spherical closed surface shown in the figure below. The two charges on the right are inside the spherical surface. (Take q1 = +1.96 nC, q2 = +1.03 nC, and q3 = -3.09 nC.) https://www.webassign.net/serpse8/24-p-006-alt.gif The...

Homework Statement Electric Field is given by E=(100i-200j+100k) N/C. What is the electric flux through the surface of half a sphere? (The surface is a hollow bowl open upwards, positive in the z direction, radius of 2). Homework Equations The Attempt at a Solution Ive...

Homework Statement A 10nC point charge is at the center of a 2mx2mx2m. What is the electric flux through the top surface of the cube? Homework Equations int(EA) = (Qin)/(ε0) The Attempt at a Solution int(EA) = EA + EA + EA + EA + EA + EA = 6EA A = 4m^2 Qin = 10nC ε0 =...

I was thinking of makeing some type of intensifier that would work by using a type of "flux capacitor". LOL, it is funny but I can not think of a better name for it since it would be a type of circuit that does not exist. The idea or goal of the circuit is to reflect EM waves that are in a...

Homework Statement calculate net outward flux of vector field F(x,y,z)=3xy^2 i +xcosz j +z^3k, across surface solid bounded by cylinder y^2 +z^2 =1 planes x=-1, x=2 Homework Equations The Attempt at a Solution my attempt was triple integral of divF=> 3*triple integral r^3 ended...

Homework Statement http://i885.photobucket.com/albums/ac52/HummusNFalafel/showmepl.jpg A empty cardboard box is placed in an electric field pointing upwards with a strength of 1200 N/C as shown above. The bottom of the box is tilted up by an angle Θ = 13° from the horizontal. Side A of the...

Can someone please help me work through this problem I've spent over an hour on this trying to figure out what to do.. here's the question A nonuniform electric field is given by the expression E = ay^i + bz^j + cx^k, where a, b, and c are constants. Determine the electric flux through a...

I am hoping someone here has experience with permanent magnets. I have a theory on how to size a permanent magnet for an alternator I am designing, and I want someone to confirm that my technique will yield a result that is useful enough to go through the expense of building a prototype. My...

Homework Statement A cube, placed in a region of electric field, is oriented such that one of its corners is at the origin and its edges are parallel to the x, y, and z axes as shown to the left. The length of each of its edges is 1.1 m. (a) What is the flux through the cube if the electric...

The problem I am having is that I cannot seem to find the magneto-motive force of a permanent magnet. Most material tables give a Hc in kA/m, which I take to mean I multiply by the length of the magnet, then by the area of the magnet to get my total magneto-motive force. So does...

A light source has uniform intensity I(with respect to wavelength) within a circle of diameter 3 arcmin on the sky. The flux of radiation reaching the observer is 10^(−16) erg cm^(−2) s^(−1). Calculate the intensity of the light from this source. Relevent Equations: This is where my...

Homework Statement The electric field through a region of space is given by: E = (-1.10×10^4 N/Cm2)xyi + (-6.20×10^4 N/Cm)xj + (-6.60×10^4 N/Cm)yk A square is located in the x-y plane, at z = 0, as shown in the figure below. The sides of the square have length 7.86 cm. What is the...

Homework Statement Hey as per ususal our physics course has run ahead of our maths course and started using this type of integral\oint for the equation for electric flux Homework Equations \Phi=\oint D . dA Where\Phi = Total electric flux through an area dA with electric flux...

Homework Statement A small particle, with charge q = 8.85 μC, is located at (x,y,z) = (0,0,h). Calculate the flux of electric field through the square in the xy-plane, of size L × L, centered at the origin. (B) What is the flux if h = 0.05 L? Homework Equations Flux=Charge/permittivity...

Hi, Could someone confirm for me please. As the magnetic flux increases does the e.m.f increase as well? (solenoid) And if we were to plot a graph of the two against each other, the graph will have a positive line/curve. My graph has a negative curve suggesting that as flux increases e.m.f...

Homework Statement in book there is written that this turn will make electromotive force, but from faraday law we know that force generates only when flux is changing, what about this? http://img821.imageshack.us/img821/747/schematu.jpg and they say that it generates electromotive force...

Hi, my understanding of flux is that it is the amount that flows through per unit area per unit time. with this in mind, why is the flux (of photons I am assuming) from a light bulb equal to the power, which is the energy per unit time? Thanks

Hi. Could you please give me a description/analyse a variety of flux changes that can be used to produce an emf. Could you confirm what is flux and emf in this situation?

9. Two sliding metal bars of length l = 15.0 cm are moving along two parallel rails, in opposite directions, with constant speeds of v = 0.7 m/s, as shown in the figure below. The rails are located in a uniform magnetic field with a magnitude 0.35 T that is directed into the page as shown...

Homework Statement A coil of wire with 100 turns and a cross-sectional area of 0.1 m2 lies with its plane perpendicular to a magnetic field of magnitude 1 T . (a) Describe in your own words the meaning of magnetic flux (b) calculate the total magnetic flux passing through the coil. (c) If the...