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used as a traction motor for electric trains (e.g. SR Class CP and SR Class SL electric multiple units) but has been superseded by other types of motors.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.

View More On Wikipedia.org
Recent contents Top users
  1. N

    Electrical Attraction and Repulsion Related to Distance?

    At what distance do unlike-charged ions stop attracting and start repelling? (I assume it can not keep attracting forever, unless outside force is applied to it). At what distance do neutrally charged atoms start repelling each other? (Some momentum carrying them toward each other) I've...
  2. S

    Repulsion / attraction force between magnets

    Hi, I am needing some guidance to find a way to calculate the repulsion or attraction force between (magnet/magnet) or (magnet/coil) in kg force. I know there is not a fast or easy answer to this but you will help me a lot if you can help me finding the way to calculate it. thanks for your...
  3. T

    Magnetic repulsion between 2 wires?

    Homework Statement A wire with a weight per unit length of 0.040 N/m is suspended directly above a second wire. The top wire carries a current of 30.0 A and the bottom wire carries a current of 90.0 A. Find the distance of separation between the wires so that the top wire will be held in...
  4. G

    Force of Repulsion between two people with 1% more electrons than protons

    Homework Statement Richard Feynman once said that if two persons stood at arm's length from each other and each person had 1% more electrons than protons, the force of repulsion between the two people would be enough to lift a "weight" equal to that of the entire earth. Carry out an...
  5. P

    Electrostatic force of Repulsion

    Homework Statement Identical isolated conducting spheres 1 and 2 have equal charges and are separated by a distance that is large compared with their diameters (Fig. 21-22a). The magnitude of the electrostatic force acting on sphere 2 due to sphere 1 is F = 6.5 N. Suppose now that a third...
  6. I

    How to merge an attractive force with one that has opposite charges and repulsion

    Hi, I saw this article on youtube about Brian Greene describing kaluza-klein and some ideas about tiny curved spatial dimensions: I was wondering...I'm looking for an intuitive (general idea without too much mathematics for starters) explanation as to how kaluza or string...
  7. K

    Questions about Repulsion Force: Is it Present & What Materials are Affected?

    Hi all. I have a few questions: 1. Is repulsive force present in any certain situation other than magnetic fields? 2. I read that a big enough electromagnet can attract or repel even a human being. Can the same effect attainable from a big enough magnet? 3. What materials are not...
  8. R

    Exploring the Possibility of Gravity Repulsion

    Every other force attracts and repels, gravity does not. Gravity only attracts. This is assymmetrical. We like to assume things that are not symmetrical are wrong. Why do we not assume this is wrong? Is there any possible way gravity could be repulsive? I know there is staggering amounts of...
  9. T

    Electron Repulsion: Explaining Electron-Electron Repulsion

    Can general relativity explain electron-electron repulsion? Not asking how it may explain the result but how exactly could a certain mass produce such a phenomenon as electrostatic repulsion, please be elaborate in your response.
  10. F

    Magnetic repulsion force between two cylindrical magnets

    I'm doing an investigation where I am trying to find the repulsion force of cylindrical magnets. For this I have two ferromagnetic disk magnets on their sides, so that the curved sides face each other. In the investigation I push one of the magnets with a constant force towards a stationary one...
  11. M

    Induction vs electromagnetic repulsion: which is more efficient?

    Hi, I am curious about the most efficient method of levitating an object. I am considering using electromagnetic induction or the repulsion between a magnet and electromagnet. Which would require less energy? Also I am aware of Earnshaw's law; let's ignore the complexities it causes for now...
  12. W

    How Is Core-Repulsion Energy Calculated in Ionic Molecules?

    Homework Statement The dissociation energy of a hypothetical molecule AB (composed of A+ and B- ions) is 5.24 eV, and the equilibrium separation of AB is 0.216 nm. The electron affinity of a B atom is 3.36 eV and the ionization energy of element A is 4.00 eV. Determine the core-repulsion...
  13. T

    Electron repulsion per unit volume

    Hi, I am trying to calculate how many electrons I need to confine in one cubic centimeter to make the pressure on the "walls" 1psi. I've tried the equation for the repulsion of two charges, but we're talking about trillions of electrons here and they're all pushing on each other however...
  14. J

    Electrostatic repulsion formula for plates

    Hey all I read somewhere online that Coulomb's Law only applies to spheres and point charges, and was wondering what formula is used to calculate the force between 2 plates whilst charged the same polarity Also, what is the formula to determine how much voltage is required to maintain a...
  15. H

    Magnetic repulsion Hover Boards

    Hello, I'm New and was wondering about magnetic hover boards. I have seen articles about using batteries to reverse the polarity of 50lb. lift magnets and allowing them to repel metal objects such as a piece sheet metal. I know it's possible to reverse the polarity but can it be done with simple...
  16. O

    Repulsion between two small spheres

    Homework Statement Calculate the force of electric repulsion between two small spheres placed 1.0 m apart if each has a deficit of 1.0 x 10^8 electrons. Homework Equations N = q/e qe = mg q = mg / e q = mgr / Vb e = 1.602 x 10^-19 C. k = 9 x 10^9 - not sure if relevant or not. Fe = qe...
  17. W

    Gravity: Attractive or Repulsive Force?

    If we say that a body of mass blocks the effect of gravity emanating from the objects on the far side of that body, then would it be possible to treat gravity as a repulsive force? What experiment could we run to determine whether it is attractive or repulsive? I exect this is this an idiotic...
  18. D

    Attraction and repulsion of e- and p+

    I would like to know if electrical charge is the only way to explain attraction and repulsion of e- and p+.
  19. W

    Electromagnetic Repulsion research

    Homework Statement I have made an electromagnet out of a 1 ft. iron nail, insulated copper wiring and a 1.5 D cell battery. My task is to use the electromagnet to repel a small, circular permanent magnet (1 in. dia., 1/4 in. thick) For some reason, I can only get the electromagnet to...
  20. W

    Question on electromagnetic repulsion

    I have made a simple electromagnet with an iron nail, insulated copper wiring, and a 9v battery. My intention is to use the electromagnet to repel a small permanent magnet, but for some reason, I can only get the electromagnet to attract the permanent magnet. I figure I must have a problem...
  21. D

    Final velocity after repulsion.

    Homework Statement Consider 2 magnetic masses, m1 and m2; these 2 repel each other for a distance s with force f (relative to each other)...which applies from m1 to m2. Predict final velocity of m1 and m2. Assume final distance to be v1 and v2 Assume the force that f acts is constants, i.e...
  22. X

    What is the magnitude of the force of repulsion between them?

    Homework Statement Two point charges are separated by a distance r and repel each other with a force F. If their separation is reduced to 0.293 times the original value, what is the magnitude of the force of repulsion between them? Homework Equations The Attempt at a Solution
  23. G

    Electromagnet repulsion increased significantly

    when two electro magnets are coiled the same and same direction of current are placed S to S so they repell... is the force acting upon them to separate ( push away ) exponentially increased (when they are very close) as each of the separate magnets current is increased? is there a formula I...
  24. S

    Exploring the Origin of Born Repulsion of Atoms

    hello, I am curious about born repulsion of atoms, ie short range repulsion energy term proportional to 1/r^n. I find this in many solid state type books and they all call it the born repulsion and give no hints to its derivation or where it comes from. In _Atomic Physics_ 6th ed. by Max...
  25. C

    Electric charge attraction and repulsion

    The basic law of electric charge fields is that like charges repel and unlike charges attract. This does not come out of the equations but is inserted as just an empirical observation that must be allowed for, is it not ? Am I missing something here? Compare gravity that is always an...
  26. E

    Attraction and Repulsion Forces Between Magnets

    How do you calculate the attraction and repulsion forces between two magnets? I know it depends on many factors, so for example: two 0.5"x0.5"x0.25" Neodynium magnets with a grade of 42 (Br = 13200 Gauss) that are 0.25" apart from each other (only air is separating them). Thanks for any help...
  27. P

    Understanding Coulomb's Law: Force of Repulsion Between Charged Objects

    Actually, this is not a homework question, but more of a concept problem (Sorry I can;t follow the format). We are given that the force of repulsion or attraction between 2 charged objects can be represented by : Fe = (Kq1q2)/d^2. Does this mean that the sum of the force between both objects...
  28. T

    Solve Current in Parallel Wires with Repulsion

    Homework Statement Two long parallel wires, each with a mass per unit length of 43 g/m, are supported in a horizontal plane by 6.0 cm long strings, as shown in Figure P19.64. Each wire carries the same current I, causing the wires to repel each other so that the angle between the supporting...
  29. K

    Point charges and force of repulsion

    Two point charges are separated by a distance r and repel each other with a force F. If their separation is reduced to 0.280 times the original value, what is the magnitude of the force of repulsion between them? I don't really understand this question and don't know where to start. Would...
  30. K

    Attraction and repulsion between two magnets

    Hi, I hope this is the correct place to ask this. Does anyone know of a formula to calculate the force of attraction or repulsion between two magnets of diffirent sizes and strengths? Also the magnets are not parallel to each other. Any help highly appreciated.
  31. S

    The repulsion of the atoms of gases

    Is it possible to imitate the repulsion of atoms of gas on macro-scale? (I mean: atoms of gases repell all other atoms around it using some force. Among them there is nothing (vacuum) - isn't it. Well... - imagine if you could make a macro-object that could repell all matter (atoms) (a sort...
  32. C

    Electron Repulsion & Grenade Explosions: Is There a Correlation?

    does electron repulsion have any coorelation with grenade explosions?
  33. S

    The Reason Behind Electromagnetic Attraction & Repulsion

    Why do like electrical charges repel and opposite charges attract? Is it to do with obtaining lower energy levels through movement?
  34. A

    How Do Vertical and Horizontal Magnetic Repulsion Forces Compare?

    When two permanent magnets (on the same plane) have the same poles facing each other they repel directly away from each other (Ex. horizontally). If you hold a magnet above another (North poles horizontally facing each other) and move it down vertically to the plane of the lower one, there also...
  35. somasimple

    Positive Ions in a Bilipidic Layer: Attracted or Repulsed?

    Hi All, In the attached figure, I have drawn some "virtual" ions of two kind: blue are sodium, and violet for potassium (normally solvated with water). There is more ions outside of my "vat" (bilipidic layer) than inside. All ions are supposed as positive. Since there is a difference...
  36. V

    Repulsion force between two magnets

    If I used two magnet, each being able to lift a load of 100 lb, to repel each other, what will be the total repulsive force ?
  37. W

    Magnetic Repulsion between Proton and Electron in Hydrogen

    Is it possible that the magnetic field of the proton is strong enough to force the electron to stay away from the proton? Do neutrons exert more magnetic force than protons?
  38. B

    Repulsion between two pith balls

    i kinda need help. okay I am posting my question: Two pith balls have a mass of 1.0g and have equal charges. One pith ball is suspended by an insulating thread. The other is attached to a static insulator and is brought close to the suspended ball so that they are 5 cm apart when repulsion...
  39. K

    How Does Coulomb's Law Describe the Repulsion Between Two Charges?

    What is the quantitative relationship for the repulsion of one charge by another in terms of the electric coupling constant e?
  40. J

    Attraction and repulsion for identical particles

    I briefly scanned back through old topics in this part of the Physics Forum, and didn't see any that seemed to bring up this exact issue, so... I have read in several popularizations of physics that the exchange of bosons between a pair of identical particles will cause attraction if the...
  41. L

    How does water respond to repelling magnets and vice versa?

    an old 'newbie' with first post. excuse my physics knowledge it has been a long time since college. >>>QUESTION below<<< Magnets repel (each other). If repelling 'each other' through a plane (ex. piece of glass) and water is allowed to flow over the plane. WHAT will happen to the water when...
  42. T

    Uncertanty principal and repulsion forces of quark & gluons 2 question

    in the atom if you try to look into a neutron for example you would see the quark/gluon triangle but if you use a wave length to spot it won't the uncertainty princable make the particles change there location and so disrupt the nucleus and rips it apart. is that possible? Question 2 is...
  43. N

    So why is it that attraction and repulsion can be so closely linked?

    Attraction -- Repulsion I was thinking of the Seinfeld episode where Jerry is turned on watching his girlfriend run her fingers through her hair. She, on the other hand, is turned off watching him scratching his head. It's strange how attraction and repulsion works. It seems there is good...
Back
Top