Electrodynamics Definition and 419 Threads

Is there anything like *crash course* for electrodynamics ?

When finding the polarization of the dielectric portion between the two plates using P=\epsilon_{0} X_{e}E, why would we use the E-field in the air portion (as is done in the solutions manual and here: http://www.getofftheinternet.net/s_10077.pdf ) instead of solving for the E-field in the...

Galilean Electrodynamics?!? I finished reading The History of Pi by Petr Beckman, thoroughly enjoyed it and wondered what other works/activities the author was involved with. Soo I eventually came across this thing called "Galilean Electrodynamics" (which Beckman apparently had a hand in...

Homework Statement Hi all. Please take a look at the attached circuit, where the current is direct (i.e. DC). I have found the following differential equation using Kirchoff's laws: V=\frac{R_1+R_2}{R_2C}Q+R_1\frac{dQ}{dt}. I wish to solve this equation, and thus to find Q(t).The Attempt...

Homework Statement Hi all. I am looking at a R-C circuit (in series) with DC. I am just trying to analyze what happens at the instant the switch is turned on. If we set up Kirchoff's second law for this system, we can see that the current will not be constant, and this is because the...

Homework Statement The question given is an electromagnetic wave incident on a vacuum metal interface. The wave is incident normally. We're given that the metal is a good conductor i.e. \omega \tau <<1 where \tau is the collision time of the metal and omega is the angular frequency. The metal...

Homework Statement This is from Prob. 2.25 Two point charges with separation d, P is a point at a distance z above the mid-point of the charges. The last sentence asked if one of the positive charges is changed to a negative one, what is the potential at P? What field does it suggest? Explain...

(Ok, post edited. It should be ready for reading.) I'm attending an electrodynamics course and the notation is in differential forms. The course material, however, is not yet finished so it's very coarse. We're supposed to have an introduction to differential forms as the course proceeds, but...

Hi guys, I came across On the Electrodynamics of Moving Bodies while searching the net on relativity. I started reading it cause I thought It would be quite fun to do, not hoping to understand allot of it. I understand the basic (no-mathematical) concepts behind relativity, but I would like to...

On the Z=0 plane the charge distribution is of the form \rhos=\rho0 sin( \alpha x )sin( \beta y ) find the potential everywhere, assuming that \phi(z\rightarrow±\infty)=0 according to the answer, we should look for a potential of the form A sin( \alpha x )sin( \beta y )f(z) (due to the...

Hello, I don't fully understand the meaning of Green function, and how one should use it. According to Jackson's "Classical Electrodynamics" - 'the method of images is a physical equivalent of the determination of the appropriate F(x, x') to satisfy the boundary conditions'. Where Green...

I am curious to hear people's opinions and to run a poll on the use of the term electrodynamics vs. the term electromagnetism. Which do you prefer; why? Are there instances where you would use one over the other? Etc? To start off: Some like the use of electromagnetism when speaking of the...

I'm engaged in self-study with advanced undergraduate-level physics, currently focusing on Griffith's Electrodynamics text. I'm enjoying the problem sets in the text, but I sure would love to do some lab-work here at home. Does anyone know any good references for E&M labs or experiments?

I was playing around with some manipulations of maxwell's equations and seeing if I could work out the wave equation for light. I get: (\nabla^2 -{\partial_{ct}}^2) \mathbf{B} = -\mu_0 \nabla \times \mathbf{J} (\nabla^2 -{\partial_{ct}}^2) \mathbf{E} = \nabla \rho/\epsilon_0 + \mu_0...

Hi: I've heard that in electromagnetism, there is a system of units called Lorentz - Heaviside system, and that in particle physics, tis system is used insted of the gaussian or the SI. Why do particle physicist use this system? and by the way, How do we go from the Gaussian...

We all know this book... its is basically the SR as we know it. you can find it here ww.fourmilab.ch/etexts/einstein/specrel/www what i was looking for was how and on what basis back on 1905 the Albert figures out the speed of light is constant... all I get is this "Any ray of light...

Hi guys I have some questions about electrostatics, and I hope you can help me. Here they are: 1) Please take a look at the following example...

[SOLVED] Electrodynamics and electrical fields The question is: A long cylinder carries a charge density that is proportional to the distance from the axis ρ =kr, where k is a constant, r is the distance from the axis. Find electric field inside the cylinder. My attempt: Ok, first of all...

Hi, I have a computational question which concerns forms. I want to compute the variation of the electrodynamic Lagrangian, seen here as an n-form: L = -\frac{1}{2}F \wedge *F with F=dA. I want to derive the Noether-current from this Lagrangian. The symmetrytransformation we are concerned...

Consider two concentric spherical shells of radii R1 and R2 (R2>R1 ) which are maintained at potentials V1 and V2. Find the potential and the electric field in the region between the two shells, and show that the charge on the inner shell is given by q1= -4 pi...

hello, I've just gone through a derivation using the vector potential A, and using the equation derived (a wave equation) which arises from using the lorentz gauge, it is applied to the problem of a current sheet in the xy plane, located at z=0 with current in the x direction only. the current...

[SOLVED] Electrodynamics problem: charge origin? When you have an insulating region within a conductor and an electric field is applied such that a current flows, this current will be made to move around the insulating region. -I assume a charge distribution will arise on the surface of the...

can anyone tell me whether jackson's or landau and lif****z's E&M book is better for self study (basically which is better for learning the theory and doing the problems also) assuming all prerequisite knowledge and material has been met (such as griffiths E&M text).

Hi all, I'm a bit confused about ferromagnetism (and I've come to realize that I'm not the only one)! I'm currently studying electrodynamics and field theory in general to solidify my understanding of such, but permanent magnets and ferromagnetic materials seem to be often ignored in the...

If you could only do one which one would you choose? And why?

Id just like to start by saying I believe relativity is 100% at least in macroscopic terms. However, I'm having trouble seeing what the conflict was between electrodynamics and relativity. Electrodynamics in a nutshell states that light goes a constant c. relativity states that physical...

[Note: my first post attempt gave me an error message, so I think it didn't go through as I don't see it showing up in the forum; apologies if this ends up duplicate and in that event please delete one copy.] The site I found this on is pretty crackpot, but I'm interested in debunking this...

Homework Statement Hi to everyone! I would like you to help me for a problem of classical electrodynamics. I have to study the relativistic motion of a charged particle in a coulombian field with center in the origin of the cartesian axes. I have to study the case in which the initial...

Homework Statement 9.8a) Show that a classical oscillating eletric dipole p with fields given by (9.18) radiates electromagnetic angular momentum to infinity at the rate \frac{d\mathbf{L}}{dt}=\frac{k^3}{12\pi\epsilon_0}\textrm{Im}[\mathbf{p^*\times p}] Hint: The electromagnetic angular...

The short version:I'm taking Classical electrodynamics this semester, I found out that I have this book: Classical Electrodynamics by J.D.Jackson Anyone know this book?Would it be a good choice to help me study?

Homework Statement A localized electric charge distribution produces an electrostatic field, {\bf E}=-\nabla \phi Into this field is placed a small localized time-independent current density J(x) which generates a magnetic field H. a) show that the momentum of these electromagnetic...

Chapter 7 of Jackson's Classical Electrodynamics Well I've been up for a few hours, and here I am at night, midway through swimming the brisk cold English channel that is chapter 7 of Jackson's Classical Electrodynamics (my first problem set is due Wednesday - six problems), and... well, just...

If someone could help me with this one that would be great. My prof has not been in his office in quite some time... -A wire of cross-sectional area A carries a current I, and has zero net electric charge in frame O. (a) Find the magnetic field a distance r from the axis of the wire (b)...

Could anybody help me solve this equations ( I'm sorry for my english) m\frac{d^{2}{x}}{dt^{2}}=qB\frac{{dy}}{{dt}} m\frac{d^{2}{y}}{dt^{2}}=qEy-qB\frac{{dx}}{{dt}} m\frac{d^{2}{z}}{dt^{2}}=qEz X(0)=Y(0)=Z(0)=0 \frac{dx}{dt}(0)=Vx \frac{dy}{dt}(0)=0...

I just finished Griffths intro. to electrodynamics and works half of the problems Griffths provided. Now,I attempt to read Jackson's electrodynamics and found it is very hard for me... Indeed, should I need to go back to Griffths's electrodynamics and learn those concepts again? or I should try...

The problem and a solution can both be found here. In this problem there is a line charge and two conducting planes at the axis. You use the method of images to solve it. The first three parts are easy enough. The fourth asks what the electric field is far from the origin. I do not know...

I am interested in attempting to work through Jackson over the summer and I am wondering what mathematics backround is necessary before doing this. I have ken calc 1-3, DE, complex analysis (for engineers), and a probability and statistics course. Surprisingly, I have never taken a linear...

My first homework assignment for griffiths is underway. Here is a problem I can't figure out. Q. Two identical conducting small spheres are placed with their centers 0.350 meters apart. One is given a charge of 12.0 nC and the other is given a charge of 16.0 nC The spheres are...

Some of the comparisons between gravity (in the weak field limit) and electromagnetism were really interesting (https://www.physicsforums.com/showthread.php?t=80710 ). Unfortunately, that got locked due to someone presenting their pet theory. The topic seems too good to end, so let's hope we...

GR and EM are classical field theories, but later in the questions I wish to treat this in a semiclassical manner. For those helping to answer, please be specific which answers can be done in a purely classical manner, and which require quantum approaches (and please let me know if the...

Hello I have a question I got which I've been sitting on for weeks. I have an electron going through a conducting infinite cylinder of R radius. I need to know what the induced charge is on the cylinder, and the potential, for different speeds of the electron. a) for slow speed v<<c b) for...

Although this is usually a graduate course, I want to know what all the preqrequisites for studying it seriously are. (I've been reading Feynman, Schweber and a bit of Griffiths which pumped my interest). I think mathematics should be calculus, group theory and all the stuff needed for QM. As...

Any one can guide me to some good books about 4-dimentional electrodynamics? I don't want books that starts from electromagnetical theorems for maxwell, i want them to start from 4-dimentional systems and operations on them or tensors about them Thanks,,

This is a question regarding electrodynamics. Specifically I am reffering to p.294-296 of Griffiths 2rd edition. If you have the book it will be easier to see what my question is if you see the picture. There a loop with a resistor on the right end, part of the left side of the loop is in a...

I'm trying to derive the Lorentz-invariant field equations, using a point charge (well, a positron actually) centered in the coordinate system. I'm trying to find the electric & magnetic fields generated by it. I've tried using Dirac delta functionfor the charge density. S' frame of reference...

Hi I have a hard time understanding what the curl really means in Maxwell's equations, for example in a steady-state you have \nabla\times \textbf{E} = 0 and in a time-varying field you have \nabla\times \textbf{E} = -\frac{\partial \textbf{B}}{\partial t} The meaning of the...

Find out if it's your friend or foe when you're using this book. http://textbookreview.blogspot.com/

What is a good textbook that gives a basic understanding of quantum electrodynamics? My university doesn't have any courses in this subject so I am going to have to teach to myself. What do I need to know and understand before I dig down into quantum electrodynamics? So far I am at my...

in quantumdynamics, the stability of electron of H atom is a hypothesis. but if electrodynamics is right in quantum theories, electron circling a H atom will emit energy, then how can electroquantum theory give a sound prove of the stability of electron? thanks.

What do the mirror image problems in electrodynamics exactly focus at? Are they only based on the uniquesness theorem ,which we study in Differential equations.!But i find their application to be limited since they can be applied to a surface which is grounded.! One more thing ,how does it...