Interaction Definition and 653 Threads

Hey all. I was wondering what the interaction between Electric and Magnetic field lines are. For example, when you hold up a magnet against a charged electrode. I tried searching in google, but everything just turned up one or the other or how a moving charge makes a magnetic field and etc.

Gravity interaction is possible between: A.Electromagnetic radiations. B.Material objects. C.Both material objects and electromagnetic waves D.None Can someone tell me its ans with reasons?

Homework Statement Find the force of interaction per unit length between the upper and bottom halves of a cylinder of uniform charge density rho. Homework Equations Solution should be \rho^2R^3/3\epsilon_0 The Attempt at a Solution Frustrated cause I've solved this problem in...

In electron ionisation, how does the electron beam transfer energy to the molecule being ionised? Is it via the interaction of the electric fields of the electrons in the molecule and the beam? If so, what type of interaction? And why is ionisation efficiency of the beam maximised when the...

what is the difference between a "mass state" and an "interaction state"? I've encountered these terms a few times with no explanation, and googling around turns up absolutely nothing. Can anyone give me a brief description of the two terms, suitable for undergraduate level? thanks.

What are interaction states and what are mass states? Which ones are physical states? Which ones appear in Feynman diagrams? Explain your answer. I have that an interaction state is the state of a particle before the Higgs mechanism and the mass state is after the Higgs mechanism has given...

For a project, I'm trying to describe the interaction energy between two particles suspended in water which contains ions. I seem to have the double layer effect worked out pretty well, but I'm having trouble with the Van der Waals contribution, or more specifically, with the choice of Hamaker...

Spin orbit coupling accounts for the relative motion of a magnetic moment interacting with an electric field. Is there a direct coupling of the magnetic moments of, say, the electrons in an atom as well? Does a magnetic field emanate from spin 1/2 particles in general? Thank you for...

How does an electron that passes near an atom (near, but yet not that close to the nucleus) lose kinetic energy and releases an x-ray photon with energy equal to the amount of the lost energy. Shouldn't this interaction be an elastic one? I am not talking about an interaction with any of the...

Doing some examples I came across the question: Can the following processes occur and if not, why not? Draw Feynman diagrams for the allowed processes. one of which was K(-) (u(bar) , s) + p → K(+) (u , s(bar)) + Σ(-) (d,d,s) I thought that the strange quark could emit a...

Talking to the point, I need to know how a free neutron interacts with light (or a photon). Or, if they do not interact, the reason behind it. The reason why I am asking this question: Assume that a free neutron is being hit by light. If I assume that light is an EM wave, I can conclude...

Please teach me this: Because perturbative QTF theory is an asymptotic theory,then when the series is divergent(the terms of series increase as the n(the number of terms) tend to infinite) I wonder whether the theory is meaningfull or meaningless. Thank you very much in advanced.

I recently read a post which stated that the particle-antiparticle pair can be created by the interaction of photons "2 GeV is a threshold for proton-antiproton pair production, for example through photon collisions" I want to know more on these types of photons, their classifications and...

This is really about challenging the understanding of "Time" in the physical sense. I would like to test the hypothesis that time is merely the manifestation of particles in their interaction to one another. It seems that time may be meaningless (and non-existent) in a one-particle system...

I'm trying to get a deeper understanding of how two particles such as protons interact with each other. In high school physics, I was told that they give off a field, which is felt by the charges, and then repels them. My first question is, if I fire two protons at each other head on (lets...

HI, I want to reproduce results from the article (attached). I need to get parameters of interaction between atoms of H2 and C6H6 for Morse equation. I easily got results of interation between MOLECULES H2 and C6H6, shown in Table S2 'The first-principles and Morse force field (eq.1)...'...

Sometime during the last couple of weeks, during which I've been doing a lot of poking around on this forum and various other sources on the internet, I ran across something to which, unfortunately, I have lost the reference. It may even have been off of a link somewhere in this (cosmology)...

Homework Statement Two charged objects Q1 = +4Q and Q2 = -Q are located on the x-axis. Q1 is at the origin and Q2 is at the x = +S m position. You also have a test charge +qo Homework Equations F = kQq/d2 The Attempt at a Solution So you find that qo is past Q2 on the x-axis...

Why is j=0 to j'=0 forbidden by the parity rule if spin orbit interaction is significant?

Homework Statement One of the mediators of the weak interactions is the Z boson, which has a mass of 91 GeV/c 2. Use this information to find an approximate value for the range of the weak interaction. Homework Equations This is the part that I am having trouble with. I don't know where to...

In my opinion, there should be a magnetic-dipole-dipole interaction between 2 1s-hydrogen atoms, but i could not find anything that confirms this. first of all i discovered this equation here: http://en.wikipedia.org/wiki/Magnetic_dipole%E2%80%93dipole_interaction the potential energy U = -...

I'm not sure what is the correct interaction hamiltonian between an electron in an atom and electromagnetic wave (described classically). According to me there exist two version of this hamiltonian which differ by factor 2: H_{int} = \vec{E_0} \vec{r} \cos(\omega t) or H_{int} =...

Homework Statement A harmonic oscillator starts in its ground state (n=0) at t=-infinity. A perturbation H = -xF(t) is applied between t= -infinity and t = T. (a) by considering the corresponding classical interaction explain why this represents the application of a time dependent force...

I'm working on a problem involving decay of a 2 strange/2 anti-strange tetraquark particle. 4 sample decay diagrams are given and I am to describe them and choose which is most prevalent. In on diagram, two of the strange/anti-strange quarks become two down/anti-down quarks via gluon through...

Just wondering... If the interactions between fermions are the emittance of a boson (from what I understand from the grand design book by stephen hawking) then when you punch someone, is it just high levels of bosons being emmited and clashing or are the actual boson particles colliding?

It's hard to me to understand about the interaction between protons and neutrons by the means of entropy. And Is it possible to know about an entropy of an interaction between protons and neutrons or between quarks:biggrin:?

Homework Statement state which one is dominant in Photoelectric effect, compton scattering, pair production, 1- Gamm rays in AL with 1MeV 2- Gamma rays in H with 100keV 3- Gamma rays in Iron with 100KeV 4- Gama rays in C with 10MeV 5- Gamma rays in Lead with 10MeV Homework...

Hi All, How can a high energy (above 1 MeV) gamma ray interact with a protium (hydrogen with only a proton in nucleus)? Does it only ionize it? Does it break it up? Does a chain reaction occur where antiparticles are formed and then annihilated, spitting out another gamma ray? I've been...

Please teach me this: Why point particle interaction(QTF theory) has UV divergences,but string interaction does not have UV divergences.Because I think that calculating the probability amplitude of a process,we must sum(or integrate) over all possible value of momentum.So how we avoid the UV...

Hi everybody, i have a question concerning potential energy (in all its forms, which basically means all forms of energy except the kinetic one). The kinetic energy of a system is always well defined: in the rest frame it is m² (convention c=1), in a frame moving at a relative speed v compared...

Homework Statement The flow of a single sphere translating at speed U in a fluid at rest far away from the sphere is given by the streamfunction, ψ(r,Θ) = (1/4)Ua2(3r/a - a/r)sin2Θ a=radius of sphere the origin is at the centre of the sphere and the axis Θ = 0 is...

Looking thru some notes one this, I came across something which I can't get my head around. The Hamiltonian of the system (Helium atom) is H = H_1 + H_2 + W, the energies (kinetic and electron-nucleus) of electron 1, electron 2 and the interaction between the electrons themselves. To find...

Considered a simple system composed by 2 electrons, like the H2 molecule, the exchange interaction is isotropic: there's no preferential direction of the spins in physical space. What is the reason? Maybe the fact that the exchange interaction deals with only with the Pauli exclusion prinicple...

Homework Statement Im being asked what is the minimum energy requiered for the process e + p -> nutrino + nutron assumptions are: 1. Kinetic energy of proton is much lower from his rest mass, not true for the electron. 2. border line case is when nutrino energy is close to zero...

Homework Statement The spin-orbit interaction splits the hydrogen 4f state into many (a) Identify these states and rank them in order of increasing energy. (b) If a weak external magnetic field were now introduced (weak enough that it does not disturb the spin-orbit coupling), into how many...

In peskin chap 4 on interaction field theory, he first introduced some basics about interaction picture(mostly in pg. 83~87) , it seems he assumed the Hamiltonians H=H_0+H_int in Schrodinger picture are all time-independent, because he used quite a lot of notations like exp(iHt), exp(iH_0t) and...

Suppose that the interaction energy between two atoms is given by: E(R)=-A/(R^2)+B/(R^10) The atoms form a stable molecule with an inter- nuclear distance of 0.3nm and a dissociation energy of 4 eV. a) Determine A and B. b) Calculate the force required to break the molecule. What is the...

According to wikipedia http://en.wikipedia.org/wiki/Diproton "Diprotons are not stable; this is due to spin-spin interactions in the nuclear force, and the Pauli exclusion principle, which forces the two protons to have anti-aligned spins and gives the diproton a negative binding energy."...

Hello all, i wonder if you can help me with a problem I am having. I have a disc and three planes (representing a road, building and roof). For this problem, the disc can be considered a plane. http://i3.photobucket.com/albums/y60/con20or/Fig1.png I know the orientation of each of the...

- We know that for closed systems, energy transfer between the system and the environment can be in the form of heat or work. -We know that for open systems or control volumes, energy transfer between the system and the environment can in the form of heat, work, or mass flow. Let's say we have...

Hello. I'm new so I am uncertain to which forum this post should be posted in so I'll just leave this here. Anyways, I was reading about the four fundamental forces and it came to my mind that the W boson is 80.4 GeV, whilst the two lepton that are excreted upon destruction are 0.511 MeV...

An experiment performed by a German king in the 13th century made me think. He put several babies into a cell with no social interaction but to feed them. They all died with no apparent reason. My question is, why was that? How can the body simply shut down if no social interaction is attained?

Why doesn't dark matter affect the movement of solar system bodies as it does with the galaxies and stars movement?. Is it possible that dark matter affects only at galaxies scales or that the heliosphere interferes with the interaction of dark matter at solar systems scales (I say this because...

In the position representation, its true that we can use operators to represent the coulombic interaction between the proton and electron of a Hydrogen atom. I've never actually given any thought as to what the elements of such an operator would be (in matrix form of course). I know these...

For a leptonic weak interaction diagram, we have an election converted into a neutino and emitting a w- particle. But only left handed part should undergo weak interaction. So basically you should have the left handed part of electron converted into a neutrino(left handed) emitting a w-...

Say we have two complex fields, f_1 and f_2 which each are solutions of the D'Alembert operator or the wave operator in three space dimensions. Say we subtract the square of the magnitude of the difference of f_1 and f_2 from the Lagrangian for the fields f_1 and f_2. In that case the Lagrangian...

My understanding of colour so far is that if we had, say, a baryon with quark content uuu, we would need to invoke a new quantum number that would allow each quark not to be in the same quantum state to avoid violating the Pauli principle. Now apparently this new quantum number is called colour...

What is a CS course that covers how software and hardware are connected? This probably seems simple to most but I have no clue as to how this interaction works. A lot of the courses I've looked up seem to be either hardware or software only. Also, is there a name for this area of CS so I can...

Gravitational force between masses is given by the law of universal gravitation. Electrodynamics force between electric charges is the Lorentz force. Nuclear force between nucleons falls off exponentially with rising the distance. The force between quarks grows in proportion to the distance. Can...

When a charged particle moves through a magnetic field, the field excerts a force in the normal-direction (90 degrees).. Is this caused by magnetic-magnetic interaction? I.e. a charged moving particle sets ut a circular magnetic field, is it this field which interacts with the magnetic...