What is Electric flux: Definition and 283 Discussions

In electromagnetism, electric flux is the measure of the electric field through a given surface, although an electric field in itself cannot flow. It is a way of describing the electric field strength at any distance from the charge causing the field.
The electric field E can exert a force on an electric charge at any point in space. The electric field is the gradient of the potential.

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  1. J

    Electric Flux and Gauss's Law for Non-Uniform Charge Density in a Solid Cylinder

    Problem A long non conducting solid cylinder of radius R has a non-uniform change density rho or (p) that is a function of the radical distance r from the axis of the cylinder. given by rho or p(r)=Ar^2 Find the E-field at regions r<R and r>R?
  2. P

    Finding Electric Flux of a Disc of Radius r

    a disc of radius r we have to find electric flux at a point which is at a distance r from the centre i have used e=(sigma/2eo)(1-x/sqrt(r^2+x^2)) the area da=2pir*dr i know flux=closed integral (e.da) and x=r after that what should i do Reply With Quote
  3. S

    How Does Electric Field Orientation Affect Flux Through a Cylinder?

    Homework Statement The electric field is measured all over the surface of a cylinder whose diameter is 8 cm and whose height is 20 cm, as shown in the diagram. At every location on the surface the electric field points in the same direction (+y). E1 is found to be 533V/m; E2 is 730V/m; E3 is...
  4. A

    How Is the Number of Electric Field Lines Calculated in Gauss' Law?

    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...
  5. A

    Calculating Electric Flux Through a Non-Uniform Hemispherical Surface

    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...
  6. S

    Difference between Electric flux density,electric field strength .

    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...
  7. A

    How Is Electric Flux Calculated Through a Nonuniform Field in a Box?

    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...
  8. M

    Electric Flux Problem: Finding Charge per Unit Area on a Charged Plastic Sheet

    Homework Statement A 15.2-g piece of Styrofoam carries a net charge of -0.702 µC and is suspended in equilibrium above the center of a large, horizontal sheet of plastic that has a uniform charge density on its surface. What is the charge per unit area on the plastic sheet? Homework...
  9. U

    Calculating Electric Flux on Hemispherical Surface | Gauss' Law Solution

    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...
  10. M

    Question Related to Electric Flux

    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...
  11. A

    How Does Charge Q Affect Electric Flux Through a Hemisphere?

    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...
  12. Vyse007

    Gauss's Law with electric flux density

    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...
  13. B

    Explaining Electric Flux with Enclosed Charges

    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...
  14. 1

    Calculating Electric Flux through a Cube with a Moving Charge

    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...
  15. C

    Point charge and electric flux

    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...
  16. A

    Electric flux through the surface of half a sphere?

    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...
  17. M

    Electric flux through surface of a cube?

    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 =...
  18. E

    What is the flux through side B of the box?

    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...
  19. R

    How Do You Calculate Electric Flux Through a Nonuniform Field?

    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...
  20. R

    What is the Difference Between \oint and \int in Electric Flux Integrals?

    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...
  21. M

    Proving Electric Flux Density: eE Determination

    How to prove that D = eE. Use a general proof. I know how to prove it assuming a point charge.
  22. A

    Is the Electric Flux Always 0 for a Uniform Electric Field?

    Homework Statement Not really a homework problem, but I have a conceptual question assume a uniform Electric field in a direction, meaning Electric field does not change by location if you have any objects, the total electric reflux is always 0? Homework Equations Electric reflux=...
  23. B

    Electric flux (Φe) vs electric flux density (D)

    As the title states i would like to know the definitions of the above two terms. Also i would like to know the differences and a relation (if there is one) between them. I would be really grateful to anyone who takes the time to answer my probably silly questions.
  24. C

    Calculating Electric Flux Φ w/o typical Gaussian surface

    Hello all, new here. In the past few weeks, I have been trying to gain a basic understanding of classical electricity and magnetism through the fantastic lectures at http://ocw.mit.edu, specifically the physics course...
  25. J

    Electric Flux Entering Cone of Radius r and Height h

    Homework Statement what is the flux entering a cone of radius r and height h located in a uniform electric field E parallel to its base? Homework Equations flux = E.ds The Attempt at a Solution
  26. J

    How Is Electric Flux Calculated for a Non-Uniform Field in a Cube?

    Homework Statement Consider a cube of sides L. Suppose that a non-uniform electric field is present and is given by E(x) = {a(x+L)^2}x - (ayL)y where a is a constant. a) determine the elctric flux through the face of the cube that lies in the xy plane at z = 0 (express answer in a & L...
  27. B

    Electric flux through cube with nonuniform electric field

    Homework Statement A closed surface with dimensions a=b=0.400m and c=0.600m is located as shown in the figure (be aware that the distance 'a' in the figure indicates that the rectangular box sits distance "a" from the y-z plane). The electric field throughout the region is nonuniform and...
  28. Y

    Why Electric Flux \Phi is Defined

    Why the electric flux \Phi is defined as EAcos\theta? I don't understand the part about cos\theta...
  29. T

    Electric Flux problem calc based phys

    Homework Statement A 2.4m X 0.5m rectangular metal sheet is bent at its center line, so that the bent portion makes an angle of 30 degrees with the xy plane, as shown in the figure in the link http://tinypic.com/r/15wdytx/5 . A constant electric field E=(25j +80k)(Newtons / Coulomb) is applied...
  30. S

    Total Electric flux on two charges

    A point charge q1 = 9.00 nC is located at the origin, and a second point charge q2 = -3.00 nC is on the x-axis at x = 1.00 m. What is the total electric flux due to these two point charges through a spherical Gaussian surface centered at the origin and with radius (a) 0.500 m? E =...
  31. C

    Gauss's Law - electric flux through a spherical shell

    Homework Statement A spherical shell of radius 4 m is placed in a uniform electric field with magnitude 7020 N/C. Determine the total electric flux through the shell. Answer in units of N · m^2/C. Homework Equations Gauss's Law The Attempt at a Solution I thought this would be as simple as...
  32. C

    Electric Flux through a square

    The electric field in a certain region of space pints in the z-direction and has magnitude E =5zx, where x and z are measured from some origin. Calculate the flux of that filed through a square perpendicular to the z-axis; the corners of the square are at (x,y,z) = (-1, -1, 1), (-1, 2, 1), (2...
  33. D

    Can electric flux be measured in Coulombs?

    Learning electrodynamics here, and the book I'm reading says the following: "By definition, one coulomb of electric charge gives rise to one Coulomb of electric flux, hence Psi = Q (Coulombs)." Yet I'm reasonably certain that flux is not simply charge, and is not measured in Coulombs alone, at...
  34. S

    What is the Electric Flux Through a Cube and How Can it be Calculated?

    Homework Statement A cube has sides of length L = 0.500 m. It is placed with one corner at the origin as shown in Fig. 23-29. The electric field is uniform and given by E = (2.50 N/C) i - (4.40 N/C) j. Find the electric flux through each of the six cube faces S1, S2, S3, S4, S5, and S6...
  35. K

    Gauss's Law and electric flux of a surface

    Four closed surfaces, S1 through S4, together with the charges -2Q, Q, and -Q are sketched in the figure below. (The colored lines are the intersections of the surfaces with the page.) Find the electric flux through each surface. (Use Q for the charge Q and epsilon_0 for 0.) (Picture Attached)...
  36. B

    Electric flux through a spherical surface

    Homework Statement Three point charges are located near a spherical Gaussian surface of radius R = 6 cm. One charge (+3Q) is inside a sphere, and the others are a distance R/3 outside the surface. What is the electric flux through this surface (Q = 6 C) Homework Equations I am aware...
  37. A

    Calculating the net electric flux

    Homework Statement When calculating the net electric flux, we use the equation EA=electric flux. If there are multiple charges in different closed surfaces, do we use the net electric field multiplied by the area for each closed surface to solve the electric flux for a single closed object...
  38. A

    Unravelling Electric Flux: Area Vector and E-Field Vector

    1. When solving for electric flux, we dot product the area vector and the e-field vector. Why does area have a vector, and why is it perpendicular to the surface? Homework Equations phi=EAThe Attempt at a Solution Isn't area scalar; Is it because we just want to simplify the calculations so we...
  39. A

    Understanding Faraday's Experiment and Electric Flux

    I knew about Faraday's experiment of the 2 spheres but i can not understand the relation between his experimental results and what called the electric flux and surely the translation of all of this to the famous Gauss' law . So i need help to understand the whole idea about flux ..
  40. K

    Given the electric flux find the total charge in a tiny sphere

    Homework Statement Given the Electric flux density of \vec{D}=\frac{100xy}{z^{2}+1}\vec{u_{x}}+\frac{50x^{2}}{z^{2}+1}\vec{u_{y}}+\frac{100x^{2}yz}{(z^{2}+1)^{2}}\vec{u_{x}} C/m^{2} find the total charge inside a tiny sphere with a radius of r=1\mu m centered in c(5,8,1).Homework Equations...
  41. W

    What Are the Units of Electric Flux?

    Hi all, What is the unit of electric flux? I know this is an easy question, but I've seen different units. In the following, I use the integral form of Gauss's law: \oint E\cdot dA=\frac{Q}{\epsilon_0} 1. Many physics book and parts of Wikipedia vaguely say that the integral on the left side...
  42. E

    What is the Difference Between Magnetic and Electric Flux?

    Hello guys, just have a question. are these definitions true for the magnetic flux and electric flux??: Magnetic flux: The number of magnetic filed lines which are passing through a CLOSED surface. Electric flux: The number of electric field lines which are passing through a CLOSED...
  43. T

    How Is Electric Flux Calculated Through a Cube Face with Multiple Charges?

    Homework Statement A particle with charge Q= 5.00 microcoulombs is located at the center of a cube of edge L= 0.100 m. In addition, six other identical charged particles -q are positioned symmetrically around Q. Determine the electric flux through one face of the cube. Homework Equations...
  44. B

    Electric Flux through a surface.

    Homework Statement Consider a spherical region V of radius R without any charge and a point charge q outside the spherical region at a distance d from the center as shown in the figure. Evaluate explicitly the net electric flux out of the surface S which bounds the spherical region V...
  45. R

    Electric flux (positive, negative, or zero?)

    Homework Statement Imagine a positive point charge on the left side of the picture and an area defined by a loop on the right. I was asked to draw and label the area vector and sketch the electric field lines due to the point charge, which I did. The next questions asks: Is the electric...
  46. Z

    Electric Flux Density / Electric Field Intensity

    Hey people, I'm struggling to understand exactly what Electric Flux Density D and Electric Field Intensity E are. So far, my understanding is that D depends on relative permittivity, while E depends only on the permittivity of free space. Also, I understand that D reflects only the free...
  47. B

    Calculating Electric Flux Through Planar Surfaces | Solved Example"

    Electric flux question (solved it) Homework Statement I have to find the flux of F = ix + jy + kz through three squares, each lying in the xy, xz, and zy planes with sides of length b. Homework Equations flux with planar symmetry - E*A. The Attempt at a Solution The flux through...
  48. E

    Does a constant electric flux produce a current?

    Hi! Suppose I have a wire with a potential difference V=bx where b is a constant. Then there is an electric field which is constant: E=b through out the wire. Well, now consider this relation: I=\frac{dq}{dt}=\frac{d}{dt}\epsilon_0\int{\vec{E}\cdot\hat{n}dS}=\epsilon_0 S \frac{dE}{dt}=0 where...
  49. H

    Electric flux related to perpendicular suf?

    Electric flux related to perpendicular suf? Hello. This is my first in here. I am studying on Physics electricity and magnetism. While I am reading the concept of electric flux, the textbook repeatly mention about "perpendicular to the surface" . Why is the perpendicular surface important...
  50. E

    Electric Flux on a Cylindrical Gauss Surface

    Homework Statement A cylinder of length L and radius R is centered on the z-axis in a region where there is a uniform electric field of E i. Determine the flux for the fourth of the cylindrical surface where x > 0 and y > 0. Homework Equations \phi = \int E dS The Attempt at a...
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