Dipoles Definition and 107 Threads

Hello, I need to calculate the expression for a current on two dipoles separated as shown in the attached full task . I need to present a solution,lets take the simplest case. Theta_in=0 I need to find the expression for the currents on the dipoles...

Problem: Attempt at solution: So "energy passing through per unit area per unit time" is equal to $$I = \frac{E_i}{A t}$$ So for a the graph will be in the form of ##y=1/x##? For b) do we have to solve the differential equation $$dI = \frac{E_i}{A dt}$$?

In my book it is written "Ends of dipole possesses partial charges. Partial charges are always less than the unit electronic charge (1.6×10−19 C)". Suppose in a double bond(two electron is shared by each atom) or triple bond(three electrons are shared by each atom), can the electronegative atom...

I am extremelly confused with this question: Basically suppose we have two electric dipoles, parallel to each other, as follows in the figure: I am supposed to show that the force is attractive and radial. But I am not getting how it can be radial (pointing toward each other)! See, the force...

Let's say I have a constant magnetic field and I dive into it a diamagnetic material. Griffiths says that in the presence of a magnetic field, matter becomes magnetized and it will be found to contain many tiny dipoles with a net alignment along some direction. However, what's exactly the link...

Draw graphs showing how interaction energy depends upon the relative orientation of two dipoles if (i) p1 is parallel to r, (ii) p1 is perpendicular to r. I've done the first part and found the interaction energy as UInt = 1/(4*pi*epsilon0*r^3)*[p1.p2-3(p1.r^)(p2.r^)] which I know is correct...

I'm reading about the Stern–Gerlach experiment and the only part that confuses me is how a magnetic field would deflect particles with magnetic dipoles instead of just rotating them. In this case the magnetic field is non-uniform, but it still seems intuitively strange to me since magnetic...

For clarification on "normal incidence" without drawing a picture. I'm going to assume the incoming wave has the electric field in the z-direction, the magnetic B / Auxillary H-field in the x-direction, and the Poynting Vector in the y-direction (i.e. normal to the plane of the aperture). That...

Assuming a completely clean and flat solid surface (metal and amorphous carbon as examples). The surrounding vacuum is contaminated with water vapour at very low pressure. In what orientation would the water molecules adsorb to the solid surface?

Summary:: What if you were calculating the voltage potential for a dipole, but underwater? I'm making a predictive model (in R programming) for the voltage potential at any point around a dipole. I need to be able to change parameters, one being the k constant. V=( kpcosѲ)/(r^2). Where V is...

What is the convention? Because the field lines leave the positive charges and enter the negative ones, do not they?

I was looking at some works by the members of my university physics departament and I found this one <Mod edit> Besides this abstract, the paper is in Portuguese. <\Mod edit> http://lilith.fisica.ufmg.br/posgrad/Dissertacoes_Mestrado/decada2010/denis-oliveira/DenisDaMataOliveira-diss.pdf...

Homework Statement Hi! So I am given two different microstates of a system with 10 dipoles in a magnetic field B. I am asked to find the microstate that belongs to the macrostate with the highest probability, and to give that probability. I am also asked to find the same but with the highest...

Suppose I were to subject a polar molecule to a high-frequency electric field. The polar molecule responds to the high-frequency electric field and thus it has a time-varying electric dipole moment vector. If we treated this as a classical electric dipole, it would be expected to radiate some of...

I'm an undergrad biochemistry major at a state university in NY (I've tried the chemistry forums already) trying to understand more about interactions between polar and non-polar molecules. Say I have a thin wax in water, we are taught that the entropy of the reordering of water contributes...

The think is that I would like to create a magnetic trap "minimum of magnetic potential energy in all 3 directions of space" using a distribution of magnetic dipoles as a field generator. In other words, I would like to know if setting in some way some magnetic dipoles is possible to create a...

How to model the electromagnetic behavior of mono-Si in room temperature? Shall we consider electron/hole only? Or shall we also take dipoles into account? If so, how are these dipoles generate? THX! Z.J.

I've seen a couple of equations on Wikipedia and other sites and all of them are different. I need an equation as I want to specifically calculate the force between a magnet and a steel ball. The equations I've seen is this one here...

Homework Statement A grounded Z-axis symmetric closed conductor has a single point charge at the origin within it, inducing negative charge onto its inner surface. Given the induced charge density from the unit point charge, find the surface charge induced instead by a unit dipole at the...

Homework Statement Compute the force between two identical dipoles. See Problem P63 on page 544 to set up the problem. Explain why this result makes sense by comparing it to the force between two point charges and the force between a point charge and a dipole, in terms of the relationship to...

Homework Statement A circle, centered on the origin, has a radius of 1 mm. At each "pole" (1,0), (0,-1), (-1,0), (0,1) is an electric dipole. The positive charge of +10 microCoulombs is inside the circle, the negative charge of -10 microCoulombs is just outside the circle. What is the...

Is there any interaction between a perfect magnetic dipole and a perfect electric dipole, both at rest? What abut real dipoles? What does QED say about this?

My name is Jackson Richter. I am retired from Rockwell-Collins and worked in the engineering lab for 31 years. Since my retirement my interested have peaked in radio communications. Especially in antenna design. Thanks to anyone here that would give me a little more insight with my...

Is this the correct equation to find the electric field at point p from a dipole?

Homework Statement Two short dipoles each of dipole moment p are placed art origin. The dipole moment of one dipole is along x-axis while that of other is along y axis. Then what will be the electric field at a point (a, 0)?Homework Equations The direction of electric field due to axial dipole...

A comment a lab script for a recent experiment I did noted that the mechanism by which reflection of EM waves occurs is through the induction of Hertzian dipoles in a material. Having read up on Hertzian dipoles, I have found nothing which discusses them in the context of reflection. I read...

In a --specifically uniform electric field-- (I may be wrong here) my understanding is that the dipoles will result in no net dipole force (due to cancelling out) but there will actually be a net torque experienced about the center. This torque will be trying to turn the dipole so the moment, p...

There is a project I'm working on to model the phase transition of 2 polymers with and without an external E-field. The approach I am taking is first to consider 2 types of dipoles, with a constant external field in the 'up' direction. I'm thinking in two dimensions for now. The dipoles can...

This is part of a question from Griffiths 4.5 (electrodynamics, 4th edition) Homework Statement p1 and p2 are (perfect) dipoles a distance r apart (Their alignment is such that p1 is perpendicular to the line separating them (pointing upwards) and p2 is parallel to the line separating them...

Hi all, new user here. I did a search on Google for "current dipole" during an idle moment, and discovered this forum and joined. There was an old, closed thread concerning "current dipole", started by basheersubei and including tiny-tim, sophiecentaur, and madness, which closed 3.5 years ago...

Hi guys! Sorry for all the questions on electromagnetism. My understanding is that an electric field exists in electric monopoles and dipoles, as well as moving magnetic dipoles, and magnetic fields only exist in magnetic dipoles and moving electric dipoles. Is this correct? There are 2 parts...

Homework Statement Two coplanar dipoles are oriented as shown below. If θ is fixed, what is the equilibrium angle θ' ? Homework Equations The torque exerted by dipole P on dipole P' is given by $$\vec{N'}=\vec{P'}\times\vec{E}$$ where vector E is the electric field. The Attempt at a...

I know in case of unstable equilibrium of dipoles when dipole makes zero angle with electric field intensity ,But how we decide that this is unstable equilibrium I know in case of unstable equilibrium dipole returns to it's place after the small displacement ,I want to know why or how?why/how...

Induced dipoles result in Van der Waals' forces and permanent dipoles in hydrogen bonds, right? But how do you know is a compound has formed hydrogen bonds or Van der Waals' forces? For example, HF forms hydrogen bonds while HCl forms Van der Waals' forces and not hydrogen bonds. But in HCl, H...

Homework Statement The retarded vector potential ##\mathbf{A}(\mathbf{r}, t)## in Lorenz gauge due to a current density ##\mathbf{J}(\mathbf{r}, t)## contained entirely within a bounded region of size d is $$\mathbf{A}(\mathbf{r},t) = \frac{1}{4\pi c}\int_V' \frac{\mathbf{J}(\mathbf r'...

Homework Statement Griffiths was trying to prove that when calculating the electric field inside a dielectric, we may assume the dipoles induced in it are "pure" dipoles, although they are in fact "physical" dipoles, as long as we view the field as a macroscopic field, one that is averaged over...

Homework Statement 1)HCl consists of one H and Cl atom separated by 0.127 nm, the bond length. The Cl atom has a partial charge of -0.177e and the H atom has a partial charge of +0.177e, where e = 1.602x10-19 C is the electron charge. 2)Now the HCl molecule is placed near a sodium ion Na+ with...

Hi everybody. I noticed that I don't understand dipoles correctly. I just calculated the field of a dipole. There are two charges, one positive the other negative, in the distance of d. I got for the electric field: E=\frac{q}{4 \pi \epsilon} \binom{d}{0} The problem is, that there is only the...

As I understand, when an electric field is applied to an atom then the nucleus and electron cloud will be shifted out of balance giving rise to an electric dipole moment. Some molecules have permanent dipole moments though, e.g. Hydrogen Chloride, ". . . when a hydrogen chloride molecule is...

Homework Statement Consider a pair of electric dipoles ##\mu## and ##\mu'##, oriented in the directions ##(\theta,\phi)## and ##(\theta',\phi')## respectively; the distance ##R## between their centers is assumed to be fixed. The potential energy in this orientation is given by ##\varepsilon =...

Hi! I've had this question for awhile. I asked my ochem professor and he didn't know how to answer it. My physics professor answered it but still left me with questions. In physics, the force of two charged particles is shows by Coulombs eq: F= k* q1 * q2/ r^2. My question is, why do...

Question about dipoles... I read somewhere that a dipole is a separation of two equal but opposite charges. Is this true or can the two charges of a dipole have a different amount of charge?

Question about dipoles... What is the difference between a dipole in physics and a dipole in chemistry?

Hi , I am interested to know how would the magnetic field lines be formed and what effect each one of them would have to the one next to the other in such a configuration. I have two pairs of magnets. Distance between each magnet in a pair , numbered 2, is 2 mm. the distance between the two...

Greenhouse gases absorb and then re-emit the heat energy of infrared rays which have been partially absorbed and then reflected off the Earth from the sun, which is how the greenhouse effect works. I have heard, however, that in order for a gas in the atmosphere to be considered a greenhouse gas...

Hello Physics enthusiasts Imagine an infinitesimal small current loop where the current can run clockwise or counterclockwise at frequency v. I am trying to find a linear combination of the two(current loops) which creates the same electric field pattern (far from the dipole) as a very small...

"Problem 4.5 In Fig. 4.6 ##p_{1}## and ##p_{2}## are (perfect) dipoles a distance r apart. What is the torque on ##p_{1}## due to ##p_{2}##? What is the torque on ##p_{2}## due to ##p_{1}##? [In each case I want the toruqe on the dipole about its own centre. If it bothers you that the answers...

If we put a neutral conducting sphere in an electric field, it will become polarized. A force per unit area will be experienced on the surface according to: \vec{f} = \frac{1}{2\epsilon_0}\sigma^2\hat{n} My question is, does this process heat up the conductor? And if so, where is that...

A charged particle in a magnetic field experiences a magnetic force that is perpendicular to it. But is that the case with magnetic dipoles? There was this section in my textbook describing Torque on a Bar magnet in a uniform magnetic field which states that the magnetic force m.B on one pole...

What is the key reason? I mean if you think about it, poles are just something we create to distinct the magnetic field. But they don't exist. Why do magnets attract/repel? Is it because of the dipoles? They want to aline themselves? Btw, are the dipoles in ceramic magnets equally the...