What is Magnetic repulsion: Definition and 22 Discussions

Magnetic confinement fusion is an approach to generate thermonuclear fusion power that uses magnetic fields to confine fusion fuel in the form of a plasma. Magnetic confinement is one of two major branches of fusion energy research, along with inertial confinement fusion. The magnetic approach began in the 1940s and absorbed the majority of subsequent development.
Fusion reactions combine light atomic nuclei such as hydrogen to form heavier ones such as helium, producing energy. In order to overcome the electrostatic repulsion between the nuclei, they must have a temperature of tens of millions of degrees, creating a plasma. In addition, the plasma must be contained at a sufficient density for a sufficient time, as specified by the Lawson criterion (triple product).
Magnetic confinement fusion attempts to use the electrical conductivity of the plasma to contain it through interaction with magnetic fields. The magnetic pressure offsets the plasma pressure. Developing a suitable arrangement of fields that contain the fuel without excessive turbulence or leaking is the primary challenge of this technology.

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  1. Dante Meira

    Can a superconductor "repel" an electromagnet due to the Meissner effect?

    A superconductor with little or no magnetic field within it is said to be in the Meissner state. The Meissner state breaks down when the applied magnetic field is too strong. But what happens if an electromagnet that is at first "turned off" is suddenly "turned on", in the close proximity of a...
  2. SuperTzar

    Magnetic Repulsion for a Loudspeaker Motor

    Hello, I have found an interesting alternative to the common loudspeaker motor in the form of a magnetic repulsion circuit. The picture below shows the basic idea. A coil is suspended between two magnets (or pairs of magnets) that are a certain distance apart. The magnets are mounted so that...
  3. Dante Meira

    Repulsion between permanent magnet and air core coil

    I formulated a statement about the repulsion between a permanent magnet and an air core coil (electromagnets without a ferromagnetic or ferrimagnetic core), and I believe this statement is true, but I would like to seek the opinion of others about it: "In a system where an electromagnet made...
  4. Dante Meira

    Magnetic repulsion between a permanent magnet and an air coil

    I would like to receive some input about this "equation" formulated by me, a=f(i), regarding a system with a permanent magnet and an air core coil acting as an electromagnet, as described in the image: I understand that the acceleration provided to the toy car will be a function of the...
  5. M

    Magnetic repulsion of solenoids

    I'm trying to understand the repulsive forces of solenoids. This is all paper as in I don't actually have them to test in real life. Take two solenoids that are equal to each other. Specifications: current is 10 amps Number of turns is 300 Iron rod is 12 inches/ 304.8mm, with a Radius of 2...
  6. S

    Collision with magnets -- Elastic or Inelastic?

    In my experiment I am performing a collision with two carts with magnets attached with photogates and a labquest on an air track. I pushed the carts together and made sure that the carts did not come into contact. Based on my knowledge of collisions, I believed that the collision would have been...
  7. D

    Permanent Magnets: Exploring the Source of Energy

    First off, I am new here, so please don't tear me apart too hard if I miss or misinterpret something, I'll cotton on eventually :D As I understand it, when a permanent magnet repels an oppositely charged object, such as another oppositely charged permanent magnet, no energy is technically being...
  8. 1

    Help designing/finding a vendor for this magnetic field

    I need help find a electromagnet suitable for this http://imgur.com/a/vkm4T Each electromagnet (the 3 in the center) needs a repelling force of about 20 to 40lbf. I stupidly bought these from amazon http://a.co/aSftIat. Its a holding electromagnet so the N and S poles are essentially on the same...
  9. G

    Magnet Experiment: Investigating Force & Distance

    Hello PF! I am about to conduct a physics experiment to write my high school level paper on. I initially was going to investigate the Gaussian Gun, but my physics teacher has said that I need to have real life, practical applications of the model, and to also have a variable I can change and...
  10. R

    Calculating Magnetic Levitation Force for Maglev Train Prototype

    Homework Statement We are building a maglev train for an engineering physics project. We have a prototype that is going to work for us but we are struggling with the mathematics. We are using ceramic magnets that are 3/16in thick and 1/2 inch in diameter. One of our project partners has an...
  11. J

    Does the Inverse cube law apply for magnetic repulsion?

    Was just wondering is it only possible for magnetic attraction? because the force increases exponentially with decreased distance, or can it be used for repulsion. It's blatantly obvious that magnetic repulsion is a lot weaker than attraction, by a 10% margin. hence why repulsion is weaker, but...
  12. U

    Ib extended essay about magnetic repulsion (maglev trains)

    I have been trying to come up with a good question for my Ib extended essay which is a 4000 words essay about any physics topic of my choice. However, with this topic I need to come up with an experiment to further investigate this topic and write up an analysis and conclusion. I am really...
  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. 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...
  15. 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?
  16. 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...
  17. 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...
  18. 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...
  19. 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...
  20. 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...
  21. 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?