What is Monopole: Definition and 67 Discussions

In particle physics, a magnetic monopole is a hypothetical elementary particle that is an isolated magnet with only one magnetic pole (a north pole without a south pole or vice versa). A magnetic monopole would have a net "magnetic charge". Modern interest in the concept stems from particle theories, notably the grand unified and superstring theories, which predict their existence.Magnetism in bar magnets and electromagnets is not caused by magnetic monopoles, and indeed, there is no known experimental or observational evidence that magnetic monopoles exist.
Some condensed matter systems contain effective (non-isolated) magnetic monopole quasi-particles, or contain phenomena that are mathematically analogous to magnetic monopoles.

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  1. M

    What Happened with Magnetic Monopoles?

    Does anyone knows how to explain (both physics and mathematics) why there's no magnetic mono-pole?
  2. T

    How to create monopole magnetic material?

    Hi all, During my student time, I was impressed by the conclusion that magnetic only exists in nature in di-pole, that results in the fact that it is impossible for a magnet to have only North pole or South pole. By my own experiment, recently I have discovered methods to create monopole...
  3. X

    What are the meaning of monopole character and dipole character?

    In Hehl's paper "general relativity with spin and torsion:Foundations and prospects",there is a sentence ," in the macrophysical limit, mass (or energy-momentum) adds up because of its monopole character, where as spin , being of dipole character, usually averages out." anybody who know the...
  4. M

    Electric monopole, dipole of sphere

    Homework Statement Homework Equations The Attempt at a Solution I am not sure what to do with the -4q.(did something with this) I was thinking of ignoring it, and treating it like if it is really far away, however since it is only twice the distance from the origin as the two +q charges, i...
  5. L

    Monopole Moment of a sphere of charge

    Homework Statement I'm really bad at these type of problems. I'm supposed to find the monopole moment of this continuous charge distribution. its charge is \sigma = const*cos(\theta) Homework Equations p = \int r'\rho(r')d\tau which then since we are doing a surface charge should be p =...
  6. V

    Diracs Quantization Condition & Magnetic Monopole Explained

    Hi please explain me the Diracs quantization condition for Magnetic Monopole and explain me the Magnetic Monopole by the Quantum field theory Vincent S Ryan
  7. V

    Monopole & Dipole Homework: Sphere + Line Charge

    Homework Statement A sphere of radius R and uniform charge density 'row' is situated at the origin. A uniformly charged line with length L and charge density 'lamda' (for simplicity assume L>2R) is a distance D from the origin in the y=0 plane and orientated so as to be parallel to the x-axis...
  8. S

    What Are the Monopole and Dipole Moments of a Two Charge System?

    Two point charges 3q and iq are spearated by distance a as in the diagram. Find the monopole, dipole moments and the approximate potential at large (in spherical coords including both dipole and monopole contributions) monopole moment is sum of charges 3q \hat{k} + qa \hat{k} = q(a+2) \hat{k}...
  9. Amith2006

    Expression for field due to magnetic monopole

    1)It is said that the expressions for field due to a magnetic monopole is similar to field due to a electric charge except that in the former case we take pole strength in place of charge. Is it true? i.e. Electric field due to a point charge = Q/r^2 Magnetic...
  10. O

    What application is there to a magnetic monopole?

    My book makes many statements about how magnetic monopoles do not exist and how scientist and researchers are trying to accomplish this. They also state that this would have wide applications. What they don't say is what and why? I see that if a magnetic monopole were to exist it's...
  11. X

    Magnetic monopole induces current in perfect conducting ring

    I am trying to calculate the current induced in a loop assuming a magnetic monopole exists. The loop is a perfect conductor, which I understand implies the electric field inside must be zero. I picture the problem with the magnetic monopole traveling with a velocity coaxial with the loop. I am...
  12. Orion1

    Is the Yukawa Strong Nuclear Flux dependent on both gauge and radius?

    What is the solution for a static graviton flux monopole through a closed surface? :rolleyes: Sphere surface area: dA = 4 \pi r^2 \Phi_G = \oint G_g \cdot dA = \oint G_g \cdot (4 \pi r^2)
  13. Orion1

    How Do Maxwell's Equations Account for Magnetic Monopoles?

    What is the solution in Gauss' law for a magnetic monopole based upon Maxwell's equations? Maxwell's equations: \Phi_E = \oint E \cdot dA = \frac{q_e}{\epsilon_0} \Phi_B = \oint B \cdot dA = 0 \epsilon_e = \oint E \cdot ds = - \frac{d \Phi_B}{dt} \epsilon_b = \oint B \cdot ds =...
  14. M

    Magnetic Monopole: Are Maxwell's Equations Fallible?

    While reading Serway's Physics for Scientists and Engineers, I found to my disbelief that he said: Then to contradict himself, in chapter 31 on Maxwell's equations (and this is accepted in many other texts as well), he quotes on the fourth equation - the divergence of the magnetic field is...
  15. F

    Calculating Magnetic Field of a Monopole - Dirac Condition

    I need to find out at what distance creates a magnetic monopole the same magnetic field as an electron with Bohr's magnetron magnetic momentum. I don't know how to calculate the field of a monopole. I know what an electric charge is; but a monopole? As a clue I've been given Dirac's...
  16. B

    Monopole and Dipole moments

    I'm having a lot of difficulty calculating the monopole and dipole moments for a dielectric sphere with surface charge of the form, sigma(theta)=sigma(0)cos(theta) If surface charge wasn't present and it was just a point charge I would be OK but I need a few pointers on how to do it with...
  17. W

    Magnetic Monopoles: Explained and Implications

    Briefly in our Eng PHYSII class in the text of Halliday and Resnik it talked about physicists looking for magnetic monoploles, can someone explain this and the implications of it.
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