Electromagnetics Definition and 145 Threads

In a spherical symmetric problem the only nonzero components of the electric and the magnetic field are Er and Br Why?

Homework Statement Consider potential field V(ρ, φ, z) = V_0/ρ in free space and cylindrical coordinates. Calculate electrostatic potential energy stored in half cylindrical shell defined by a≤ρ≤b, 0≤φ≤π and 0≤z≤h. Homework Equations W_E=½∫∫∫ρ_vVdV The Attempt at a Solution I have no idea...

Need a book to completely revise ED. Book not be of beginner level. Must be of Masters level. Thanks Attaching a list of topics that needs to be there in it. Electrostatics: Gauss’s law and its applications, Laplace and Poisson equations, boundary value problems. Magnetostatics: Biot-Savart...

Given a simple DC generator with a single loop in the presence of a magnetic field such as the one below, typically, the analysis involves how each rectangular loop's terminal ends up on opposite sides of an armature housing each of the coils. The analysis is fairly straightforward to then...

Homework Statement / Homework Equations[/B] I was looking at Example 5.12 in Griffiths (http://screencast.com/t/gGrZEPBpk0) and I can't manage to work out how to verify that the curl of the vector potential, A, is equal to the magnetic field, B. I believe my problem lies in confusion about how...

Homework Statement Two point charges are placed on a horizontal line, the first is +3.0-μC located at x = 0.0-m, y = 0.0-m and the second is -4.0-μC located at x = 2.0-m, y = 0.0-m. At what points on the horizontal line y = 0.0 will the electric potential be zero? Homework Equations V(r)=kq/r...

What are the best universities in the world offering ms programs in applied electromagnetics, radars and Antennas.

I'm trying to understand how electric generators work on a very basic level. I understand the heart of this is the application of the Lorentz force on a conductor moving at a velocity ##v## in the presence of a magnetic field ##B##. I also understand how it can be shown that the emf is equal to...

Given a flexible wire loop of a certain perimeter and planar shape, what are some good ideas to minimise the loop's inductance? For example, would it work if i surrounded the wire loop with a superconducting loop in the same plane?

Apologies for the melodramatic title. In studying AC current distribution in cables (skin effect), one can view the AC current as producing a time varying magnetic field in phase with the current itself (Ampere's Law). This in turn creates an electromotive force 90 out of phase with the current...

Odd question, would anybody know what would happen if a parallel plate capacitor (good conductor) had a soft magnetic material (fairly poor conductor) as a dielectric? What would be the DC/AC electrical characteristics of this?

Homework Statement Unpolarized light hits a flat glass surface, 37.5 degrees to the surface's normal. The reflected light's polarization is investigated with a polaroid. The relationship between the max and min value of intensity from the polaroid when it is rotated is 4.0. What is the index of...

the two small plastic spheres are arranged so that they can slide freely along the insulating fiber. Each has a mass of 0.1g. The spheres are given identical positive charges. a. If the lower sphere is resting against the lower knot while the upper sphere moves to a location 6 cm distant from...

I'm a junior majoring in EE and learned with 1. D.K cheng : Field and wave electromagnetics 2. Zill Cullen : Advanced Engineering Mathematics (differential Eqs. & complex analysis) 3. Gilbert Strang : Linear Algebra and its Applications +I've extremely avoided '~programming' course, so have...

Hi Everyone, I need to write an essay for my electromagnetism class and i was wondering if anyone has good topic ideas. My criteria is that it needs to be 10 pages and I would like something that is interesting for me to research and write about. I was thinking so far of magnetic levitation...

Okay so I've recently found an insane interest in physics and am becoming familiar with simple things. However the vast amount of knowledge I have not yet acquired is pretty troubling me with understanding other things. I understand that gravity is a field influenced by a mass of an...

Homework Statement A transmission line is 1 meter and has a relative dielectric constant of 2.25 Find the phase velocity u and the wavelength λ for a frequency of 50 MHz. Homework Equations λ=?(ε_r, f) u=λf The Attempt at a Solution I am unable to get from the relative...

Hello and thank you in advanced for looking at this. I have trying to come to terms with two seemingly contradictory ideas in electro-magnetics. Lenze's law and Eddie currents seem to contradict the fundamental equation F = qv X B where F is the force exerted on a particle with charge q and...

I've been looking into electromagnet design and there is a certain principle/set of equations that are bothering me... (1) B = (kμ0Ni)/L (2) ø = BA Where; - ø = total magnetic flux (wb) - B = magnetic flux density (wb/m2) I am trying to solve for an optimum cross sectional area of...

Hello I have some problems to obtaining Electromagnetic density via Ampere's Law. http://hyperphysics.phy-astr.gsu.edu/hbase/magnetic/indtor.html my problem is why we don't calculate and sum Inflow and outflow of Ampere's closed loop path.to clearing my question please take a look at below...

I'm just trying to get my head around electromagnetics for the first time, and need help understanding a question that asks: "Using BH curves find the maximum permeability of the cast iron forming the magnetic path." Now from wikipedia I know that the permeability of cast iron should be...

Homework Statement In fact, there are two problems, and I want to know whether my solutions are right or not. 1- Two charged line with density of 15 n c/m along the x and y axes (x\pm\infty, y\pm\infty), Find the Electric field at: (a) (0,0,4) (b) (0,5,4). 2- A cylinder with radius \rho=8cm...

Hello everyone, I am a first year graduate student, wavelets is one of the courses that I am taking presently. As part of the course, I plan to explore application of wavelets in computational electromagnetics (CEM). The idea behind it is to study a few applications where wavelets are used in...

Hello, I have been studying electromagnetics ever since I can remember. In school we did algebra electromagnetism. In 1st year college we did electromagnetism but with basic calculus. Then electromagnetics with vector calculus which in my opinion was far more involving than the previous 2. I...

IItsHi.I have a problem that i am trying to solve.The complete question is shown in the image: In this question i solved the (a) and (b) part.But i did'nt understand the (c) part.Can you please explain?Thank you.(Note:The answers is given beneath the question)

Why j.ds has ' closed integral ' on below equation

Homework Statement The figure shows two very large slabs of metal that are parallel and distance l apart. Each slab has a total surface area (top + bottom) A. The thickness of each slab is so small in comparison to its lateral dimenstions that the surface area around the sides is negligible...

Basically my question is this: could we, in principle, formulate all of classical electromagnetic theory purely in terms of the force one charge exerts on another, or do we need to include the electromagnetic fields in order to arrive at a complete theory? ("complete" as in equivalent to...

As learning laser fundumentals, I've just reviewed the boundary conditions for electromagnetic waves. However, I came back to a point that confused me in the past and want to get it clear now :) One of the boundary conditions, regarding the magnetic fields parallel to the medium-interface...

Author: Constantine A. Balanis Title: Advanced Engineering Electromagnetics Amazon Link: https://www.amazon.com/dp/0470589485/?tag=pfamazon01-20 Prerequisities: Better part of an Electrical Engineering or Physics BS degree Level: Undergraduate, upper level (4th year); Graduate...

I went through the book of engineering electromagnetics and I have several questions I don't understand. 1. If the line integral of electrical field is not zero at the existence of changing magnetic field, then how can KVL holds with AC current flowing in the circuit? I do not know what's...

Hey everyone. I'm hoping to get some advice from you guys. I am a senior studying Electrical Engineering. I am currently applying for graduate schools and for graduate fellowships (everything is mostly due mid-December). I plan to pursue a PhD. The only problem is, I'm not entirely sure which...

Homework Statement The circular region, ρ < a, z= 0, carries a uniform surface charge density ρ ( subscript s). Find E at P(0,0,h), h > 0. Homework Equations Coulombs law Field of a line charge and field of a sheet charge.The Attempt at a Solution I'm not sure what they are asking for , but my...

Homework Statement If V_{s}(t) = 12 sin(4*10^{4}t-\frac{∏}{4}), R = 2 Ω, L = .1 mH and C = .3 mF, obtain an expression for the current though the capacitor. See attached file for circuit. I'm really confused. I applied KVL around the loop with the coil and got that \tilde{I} =...

First of all - I'm new here, and this forum looks awesome! As for my post, I'm going to be using an inductor to emit an electromagnetic field, and was wondering if you could somehow either increase it or isolate the emission maybe via antenna? I know antennas are typically used to convert...

Homework Statement Starting with: G = \frac{I}{V}= \frac{-\int_{s}\sigma\mathbf{E}\cdot d\boldsymbol{s}}{-\int_{l}\boldsymbol{E}\cdot d\boldsymbol{l}} Derive the conductance per unit length, G', of a coaxial cable by assuming a line charge of \rho_{l} on the center conductor...

Electromagnetics -- parallel plate capacitor energy storage Homework Statement A parallel-plate capacitor 0.5m by 1.0m has a separation distance of 2cm and a voltage difference of 10V. Find the stored energy, assuming that ε=εo. If a 200-volt potential is applied in the capacitor, (a)...

At my college we can choose to branch off and focus on computers or more traditional EE classes. I really like E&M physics, but hated my signals and systems course. I'd like to take electromagnetics, but that means I would have to take communcations as well (which I hear has a lot of signals...

I am a junior EE scheduled to take engineering electromagnetics in the Fall and want to know what math topics are the most useful to review. I know E&M involves quite a bit of vector analysis but I'm not sure how deep into it I should look. For anyone who has taken a similar course, can you...

I want buy a book to learn RF circuit design(I have got a project to do next year and I wanted to start preliminary preparation now). Could anyone help me to figure out which one is better of the two - Engineering Electromagnetics by Hayt or Electromagnetics with Applications by Kraus. Thanks

I answered my own question but thank you for the help.

I would like to make an electromagnetic simulator, but I have no experience in this. I have written 3-dimensional ray tracing software for acoustic sources in MATLAB, but I did not include any boundary conditions, it was just propagation in free space through refractions. My only background...

I have come across books titled "engineering electromagnetics" and "electromagnetics with applications" but I could never find a page for electromagentics on Wikipedia. However, there are pages for electrodynamics/electromagnetism/electrostatics on Wikipedia. Is there a difference? If so what...

I am taking a course in Electromagnetic Fields Theory, and the prescribed book for us is Engineering Electromagnetics by William Hayt. We are referring to its 7th edition, in one numerical Example 2.3 we have to find total charge contained in 2 cm length electron beam where as we are given the...

I am trying to use Faraday’s law to calculate the number of turns a coil requires to produce a certain voltage. This is what I have so far. V = -N * change in (( tesla * area meters squared)/ seconds) becomes N = -1*(-V/ change in (( tesla x area meters squared)/second)) N=-1*(-V/((T*A)/S)...

Hello folks. I have an electromagnetics quiz tomorrow and I am kind of nervous. I can't seem to grasp the concept of induction, more importantly how it differs in AC and DC circuits. So in lay terms: Induction is production of electric current across a conductor which is moving through or...

The program I am looking at has an emphasis on Electromagnetics, RF and Microwaves. If I am looking at the telecommunications industry, what other exposure might be valuable? Would some course work in Signal processing or embedded systems be beneficial?

Hi All , if we have 2 charges +ve and -ve ... how Electric and Magnetic fields are been created between them and also how they will move to create magnetic field and how they will travel (propagate) ? thanks for help !

I was looking at the MS (non-thesis) in EE with a focus in Electromagnetics, RF and Microwaves. I realize jobs in military and commercial sector for communications, radar, etc. What else is out there? What kind of security would this degree offer me?

Can you guide me the research topic of electromagnetics in plasma..is it related to physics more tha nengineering..how abt the career opportunities.