Electric flux Definition and 272 Threads

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

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 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...

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 (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...

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...

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...

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...

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 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 =...

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...

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...

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

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=...

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.

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...

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

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...

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

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 =...

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...

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...

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...

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)...

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...

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...

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...

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 ..

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...

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...

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...

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...

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...

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...

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...

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...

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...

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...

Sample Problems to calculate Electric Flux 01. A point charge of 1.8mC is at the centre of a cubical Gaussain surface having each side 50cm. What is the net electric flux through the surface? Suggested answer: According to Gauss' theorem, flux = q / sigma sub0 or 1.8mC/8.854 x 10^-12...

Homework Statement A charge of 2.1 µC is 20 cm above the center of a square of side length 40 cm. The permittivity of free space is 8.85*10^-12 C^2/N*m^2. Find the flux through the square. Answer in units of N*m^2/C.Homework Equations The Attempt at a Solution I really need some help with...

Homework Statement A 0.100A current is charging a capacitor that has square plates 5.00cm on each side. The plate separation is 4.00mm. Find (a) the time rate of change of electric flux between the plates and (b) the displacement current between the plates. Homework Equations I pretty...

Temp message This is what a book says - “The number of lines per unit area through a surface perpendicular to the lines is proportional to the magnitude of the electric field in that region. Thus, the field lines are close together where the electric field is strong and far...

Homework Statement A uniformly charged conducting sphere of 1.6 m diameter has a surface charge density of 8.0 µC/m2. What is the net charge of the sphere, and what is the total electric flux leaving the surface of the sphere? Homework Equations surface charge density = q/A flux = E x...

A source states "Electric flux = q coulombs" While another states "We choose the number of field lines starting from any positively charged object to be Cq and the number of lines ending on any negatively charged object to be C|q|, where C is an arbitrary proportionality constant...

Homework Statement A 2 C charge is spread uniformly in a hollow sphere with a radius of 50 cm. a) What is the electric flux? b) What is the magnitude and direction of an electric field 200 cm away? Homework Equations Electric flux = q/(permittivity of free space) E = q/4(pi)(permittivity...