What is Repulsion: Definition and 143 Discussions

A repulsion motor is a type of electric motor which runs on alternating current (AC). It was formerly used as a traction motor for electric trains (e.g. SR Class CP and SR Class SL electric multiple units) but has been superseded by other types of motors. Repulsion motors are classified under single phase motors. In repulsion motors the stator windings are connected directly to the AC power supply and the rotor is connected to a commutator and brush assembly, similar to that of a direct current (DC) motor.

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  1. Y

    Can I Use an Electromagnet to Repel Aluminum?

    Homework Statement I have made an electromagnet using the primary core of a microwave oven transformer and a 1.5 D cell battery. I would like to use the electromagnet to repel an aluminum bar (1 in. dia., 3 in. in length, and 1/4 in. thick; it is shown in the picture) For some reason, the...
  2. V

    Bond energy - (Force/ potential E vs interatomic separation)

    Hey guys, So, I was in my materials lecture today and something the lecturers and the tutors said was slightly confusing. We were talking about the repulsion and attraction force between atoms. This is all good as I can understand how if two atoms will repel each other if they get really close...
  3. Q

    The electric repulsion of electrons and their attraction

    If electrons repel then why are particles attracted to each other so why do particles attract and what is the ratio of the gravitational attraction to the electric repulsion of both an atom and an electron? Thanks!
  4. E

    Magnet Repulsion: Stacking 10 Magnets in a Tube

    Ok I have a question that I cannot find a answer anywhere on the Web for so I'm going to try to explain it best I can. So if I stacked 10 magnets in a plastic tube, s-n-n-s-s-n-n-s-s ect... and each magnet had a repel of 10lbs, would the total repel be 10 pounds when compressed or would it be...
  5. J

    Electromagnetic Repulsion Power

    So I coiled ~3' of 28awg wire in a 1/4" coil and connected it to an AA battery. It is unable to pick up nuts but still attracts and repulses in the presence of a permanent magnet. When a piece of iron is added to the center of the coil the strength of the magnet increases, as expected, and it is...
  6. A

    Probability to overcome Coulomb repulsion

    Homework Statement The temperature in the interior of the Sun is about 1.5E7 K. Consider one of the reactions in the thermonulcear synthesis chain: p+p->H_2 + e^+ neutrino. In order for this reaction to occur two protons have to be at the distance of about 1 fm (10E-15 m). Estimate the...
  7. Arjang Sh

    Electrostatic repulsive force between parallel plates

    Hi I was thinking about two parallel plates with same charges (there's no electrical field between them). How can we calculate the repulsive force? Does anyone have any ideas besides numerical integration? Thanks
  8. J

    What happens when you remove an excessive amount of electrons.

    Lets take a simple water molecule for example. You can use the photoelectric effect to remove electrons from a molecule. As a thought experiment, let's say you have a contained single water molecule in a vacuum with no impurities. Perfect Vacuum. If you use the Photoelectric effect and beam...
  9. J

    More magnetic force less repulsion

    In doing a science project using the gauss rifle we changed the number of magnets side by side verses aditonal stages, The result was the ball traveled a shorter distance the more magnets used. I understand why this occurred but need scientific reason and explanation based on what laws of...
  10. L

    Repulsion Forces Between Northern & Southern Hemisphere of Metal Sphere

    Homework Statement A metal sphere of radius R carries a total charge Q. What is the force of repulsion between the "northern" hemisphere and the "southern" hemisphere? Homework EquationsThe Attempt at a Solution Since the sphere is metallic, its conducting and so the electric field inside the...
  11. akashverma

    Explaining the Repulsion of an Electromagnet on Metals

    Can it be possible that an electromagnet would repel a iron block?? if yes then please explain.
  12. T

    Need help for electromagnetic repulsion device

    creating force with sound Hi, I am currently building a device for the company I work for to open molds that have been plasticized together using sound. The idea is to produce a frequency that will either vibrate the lid open or push it open, but I am stumped on what calculations I need to use...
  13. B

    Magnet Repulsion: Understanding the Forces at Play

    Hi Guys! I have a, rather general, question regarding the nature of magnet repulsion. When two opposite poled magnets are put in contact, they naturally attract, but if two like poled magnets meet they would repel. Using such information: -When two like poles repel, why do they not repel...
  14. ELB27

    Force of repulsion between two hemispheres of a metal conductor

    Homework Statement A metal sphere of radius ##R## carries a total charge ##Q##. What is the force of repulsion between the "northern" hemisphere and the "southern" hemisphere?Homework Equations The force per unit area on the surface of a conductor: \vec{f} = \frac{1}{2\epsilon_0}\sigma^2\hat{n}...
  15. M

    Pauli exclusion, symmetry, and electric repulsion

    I have a few questions about the Pauli exclusion principle: 1. Why do physicists believe that the symmetry in the wavefunction we assign to particles (indistinguishability) is due to an actual restriction in the physical state space that the particles can occupy (the attributes following from...
  16. F

    Permanent magnet motor working on repulsion force

    Sir what would be the life of permanent magnet motor which runs by the repulsion of north pols. Is magnets energy wasted during this repulsion process or not. Because it continuously work on repulsion of two north pols.
  17. Entanglement

    Repulsion and attraction between atoms

    Why do atoms repel when they are close to each other and react when they are far from each other??
  18. J

    Electromagnets and Permanent Magnets: Equal Repulsion Force?

    Homework Statement My 10 year old granddaughter started her new school term last week and was presented with an electromagnet problem by her new science teacher. The class is allowed to use any non-physical method to solve this for their lesson next Wednesday. A direct link to my 'Dropbox'...
  19. K

    How Does an Electron's Charge Avoid Repulsing Itself?

    An electron is so small, how does its charge avoid repulsing each other.. is there a unit of small charge or quanta wherein the charge doesn't repel.. or is there something akin to strong force like in atoms which avoid the protons from repulsing outward in the charge of the electron? What is...
  20. S

    What is Avoided crossing or Level repulsion

    I was reading about 'Polaritons" and Happened to come across this principle called " Avoided Crossing Principle", it is also called "Level Repulsion". They say (wikipedia) that Polaritons are expressions of this quantum phenomena! Can anyone throw some light on this? I really did not...
  21. G

    Magnetic field and repulsion bewteen wires

    If you place a wire with a running current in a magnetic field, the magnetic field will exert a force on the wire. So, if you place two wires parallel to each other, the current on each will produce a magnetic field, which in turn will attract or repulse the other wire depending on the direction...
  22. J

    Graviphoton - Repulsion between Matter and Antimatter

    Gravitons are suppose to mediate the gravitational force, but there is also the graviphoton which is the graviton's symmetry partner. The graviphoton causes repulsion between matter and antimatter but this is not confirmed. Can someone explain in layman's terms how this particle could do this?
  23. Crazymechanic

    Why Do Macro Materials Wear Out If They Are Made of Micro Particles?

    Hi a simple question , hope so. If when we put a hand on the table we never actually touch the table just the electrons of our hand touch the ones on the table.The a ball bearing the balls should never actually touch the metal shells both inner and outer just the electrons of them. If this...
  24. J

    Does Antimatter Repel Matter Due to CPT Symmetry?

    According to CPT Symmetry matter has reversed charge, spatial coordinates, and time. This includes gravity. So this means that antimatter would attract other antimatter and matter would attract other matter. The difference is when antimatter gets near matter. They repel each other. First, can...
  25. J

    Is polar attraction stronger than the repulsion of electrons?

    So if any subtance has theoretically 0 degrees kelvin, it will be a solid, correct? So does that mean that temperature is the main factor that determines state of matter? What i mean to ask is, why would non polar molecules want to be close together like in a solid, when really, the electrons in...
  26. B3NR4Y

    Electron repulsion work problem.

    The problem: If two electrons are held at fixed points (5,0) and (-5,0), respectively, find the work done in moving a third electron from the origin to (3,0) All equations: Force of repulsion between two electrons: \begin{equation} \frac{1}{d^{2}}. \end{equation} \begin{equation} W =...
  27. T

    Magnet repulsion distance calculation

    hey, so let's say i have 2 Neodymium magnets with a pull force of 10 pounds and set them at a position where they repell themselves. so my question is: how can i know in what distance will the top magnet be from the other one? if there's and equation for that or an explanation, please tell...
  28. S

    Can EM Radiation Create Repulsion on Non-Magnetic Objects?

    Can EM radiations produce repulsive effect on on non magnetic objects? If yes how can such fields be produced?
  29. S

    Order of magnitude problem involving the force of repulsion between two persons

    Homework Statement Homework Equations \vec{F} = k\stackrel{q1q2}{r^{2}} The Attempt at a Solution 6.022e23*(0.505) = 3.041e23C <-- electrons 6.022e23*(0.495) = 2.981e23C <-- protons 3.041e23 - 2.981e23 = 6e21C <-- the difference between the two charges \vec{F}_{e} =...
  30. R

    Mediator of electrostatic repulsion

    Is the repulsive force between 2 electrons---(as in an electrostatic situation)---mediated by a photon----?------R Rosenthal
  31. wolfspirit

    What is the Effect of Ferrofluid Surfactant on Particle Repulsion?

    hi i am a bit confused as to what Steric repulsions are i know that a Ferrofluid surfactant makes Steric repulsions or electrostatic repulsions to counter the van der Waals and magnetic forces to stop stops the particles from collecting or clumping many thanks for any help Ryan
  32. K

    Question about magnets repulsion

    Hello, Imagine I have 2 magnets and they are repelling each other. Then I add a piece of iron in between them. Would they be attracted to the piece of iron? Yes I could just check for myself, but I'm getting my first magnets shipment only next week and I would like to start working on my...
  33. K

    How to calculate the repulsion force between a permanent and an electromagnet?

    Both the permanent and electromagnet will be constrained within a cylindrical tube (both magnets will be of cylindrical shaped, and have more/less the same cross sectional area). I want to know if its possible to calculate the repulsion force, in lbs, between the magnets, with a distance...
  34. C

    Magnetic repulsion and attraction

    You may have noticed that the materials that make good magnets are the same as the materials magnets attract. This is because magnets attract materials that have unpaired electrons that spin in the same direction. In other words, the quality that turns a metal into a magnet also attracts the...
  35. C

    Long term magnetic repulsion with permenant magnets?

    i have a set of neodynium magnets which i am using for a magnetic levitation project... will the constant exposure to an opposing magnetic field weaken the magnets over time? are 'permenant' magnets really permenant?
  36. Z

    Calculate binding energy & compare to Electrostatic Repulsion

    Homework Statement 4He2 has size of ~ 2 x 10^-15 m and a mass of 4.0015u. Calculate the binding energy of this nucleus, and compare it to the electrostatic repulsion of its constituents. Homework Equations The Attempt at a Solution For the first part I have calculated...
  37. M

    What causes electric charges? Repulsion and attraction?

    Hi, I'm an undergraduate biologist student. I was studying chemical bond, but, while trying to understand it, I couldn't really get what causes the electric charges, what seems essential to me. So, someone can explains, in the simplest way as possible, what is electric charge? What causes it...
  38. K

    Movement of a magnet due to repulsion (help)

    Basically I was wondering if I was to place a magnet inside a tube sealed at both ends via two magnets (as the diagram shows) would the magnet keep on moving up and down or would it find a resting place. I think it would find a resting place but then I also thought there will also be gravity...
  39. R

    Question on magnetic attraction and repulsion?

    This is going to be quite hard to phrase but here goes. Is there a formula/equation to find the acceleration of two of the same-charge particles, away from each other, taking into account field intensity and mass? And the same question for attraction between two oppositely charged...
  40. Z

    The Law of Action-Reaction consequence of electron repulsion?

    Or is there something else causing the action-reaction pair of forces other than the same charge of electrons in colliding objects?
  41. A

    What causes the repulsion between an electron and proton in the hydrogen atom?

    What accounts for the repulsion of the Electron & Proton say for instance in the hydrogen atom. The coulomb force "classically" is counteracted by the centrifugal force allowing for a stable orbit but this picture isn't correct in quantum mechanics, for a charge undergoing acceleration should...
  42. A

    Force of repulsion of alpha particle

    Homework Statement An alpha particle has a mass m = 6.64x10^-27 kg and a charge q = +2e. Compare the force of electric repulsion between two alpha particles and the force of gravitational attraction between them. Explain briefly why the gravitational force is ever significant, given its...
  43. M

    How Repulsion Works: Exploring Maseless Photons in QED

    Hi, I am green to QED. I could not find any more detailed answer about more exact description of atoms' repel process, both on the forum and the internet. Let's say we have a swarm of water steam particles, hitting each other. Some will join and stay together to form larger droplets, but some...
  44. M

    Sakurai: gravitational repulsion

    Hi, I was reading Sakurai's "Invariance Principles and Elementary particles". In first chapter, second paragraph (page 3), there is a line "The analogous dimensionless constant that characterizes the gravitational repulsion between two protons is ...". Any body likes to comment on this, why...
  45. P

    Electromagnetic repulsion query

    Hello, I have been playing around, making my own electromagnets. As I am out of my depth, I am experimenting with 1.5 to 9 Volt battery packs. I am hoping to have a setup where two electromagnets, around the size of a AA battery placed about an inch apart can noticibly repell each other a...
  46. R

    Explaining Electromagnetic Forces: Repulsion & Attraction

    What is the mechanism for explaining the different effect of repulsion and also attraction due to the exchange of virtual photons in the electromagnetic forces? For example, the electrostatic force between two point charges, for both when they are oppositely charged and like charged?
  47. S

    Anti-Gravity from Matter-AntiMatter Repulsion

    There's a theory being proposed that the reason for the expansion of the universe is because of the mutual repulsion of matter and anti-matter, in what is essentially anti-gravity: http://www.universetoday.com/84934/antigravity-could-replace-dark-energy-as-cause-of-universes-expansion/ So...
  48. bcrowell

    Is the Reissner-Nordström repulsion real?

    The googleable literature on the Reissner-Nordström repulsion is leaving me confused. This seems to be a contentious topic. I've found the following: 1. Grøn, "Non-existence of the Reissner-Nordström repulsion in general relativity," 1983, "The radial motion of a free neutral test particle in...
  49. S

    Reduction of magnetic repulsion

    Hope I'm in the right spot, google searches lead me here. I am working with a couple N50 ring magnets which are axially magnetized, as an alternative to a coil spring. They are going around a steel rod which acts as the guide, and is an integral part of the complete assembly. My question...
  50. J

    Electrostatic repulsion problem

    Homework Statement Suppose that two balls of mass 1.5x10-4kg each carry equal charges and are suspended by identical threads of length 11cm anchored 28cm apart. If each thread makes an angle of 20 degrees with the vertical, what is the charge on each ball? Homework Equations F=kq2/r2The...
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