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November 17, 2010

It works, #*%@#*!

devadutta @ 11:59 pm, GMT +0000 ( 1290038368 ) Play

Explain how the “thing” is defying gravity in the copper tube.

Video Link for the flash challenged.

Cracked by: apar , Ananth , Pawankumar Hegde , Rogi , jowens , dineshk , username , Raghuvansh , Manish Achuth , udupendra , Piyush , Thejas V R , wizardofid , shrik , krikkrak , Siddarth Pai , SS , Logik , Bharath , Shwetha Maiya and prasanna

Answer:
Eddy currents induced by the magnet in the copper tube creates a magnetic field which in turn slows it down. Science is awesome.
http://xkcd.com/54/

Original video:


24 Responses to “It works, #*%@#*!”

  1. apar
    2

    Eddy currents. Also, Lenz’s Law.


  2. Ananth
    4
    5
    9

    Lenz’s Law


  3. Lenz’s law – eddy currents in the tube creates a strong opposing magnetic field to the gravitational field.


  4. Rogi
    48
    10
    5

    It’s an eddy current tube (Drop a magnet down a non-ferrous pipe).
    If works by setting up strong opposition magnetic currents that buffer the effects of gravity, temporarily


  5. jowens
    13
    2

    Eddy currents.


  6. dineshk
    4
    3
    2

    Eddy current tubes – the falling magnet changes the flux in the conductor which in turn creates eddy currents. This induced current creates a magnetic field that opposes the original field as per Lenz’s law slowing down the descent of the magnet.


  7. username
    3
    3
    1

    magnet through copper tube. demonstration of Lenz’s Law

    http://regentsprep.org/Regents.....efault.htm


  8. Raghuvansh
    1
    9
    4

    The object falling through is a magnet. Copper is not magnetic but it is a conductor. The falling magnet has an associated electric field which induces eddy currents in the copper, causing production of another magnetic field. Effectively, the magnet itself generates the other magnetic field that slows it down.


  9. Manish Achuth
    16
    9
    8

    The magnet falling down the tube results in a changing magnetic field within the copper tube. This changing magnetic field produces a current within the tube. That current creates a new magnetic field within the tube which slows down the magnet.


  10. udupendra
    4
    4
    7

    Lenz’s Law – falling magnet’s changing magnetic field induces current in copper tube which in turn induces opposing magnetic field slowing down the falling magnet


  11. Magnet through Copper tube “anti-gravity” effect


  12. Piyush

    Electromagnetism. The thing being dropped is a magnet that causes a current in the copper tube/coil. This current produces a magnetic field in a direction that opposes the motion of the magnet causing it to slow down.


  13. The thing that is dropped is a magnet. As it falls it creates an eddy current in the copper tube. This current creates a magnetic field that is the direction opposite to the change that is creating the current (Lenz’s law). Due to the opposite magnetic forces, there is an attraction between them and hence a part of the gravitational force acting on the body is cancelled out. hence the slow fall.

    My long answer reminded me of 2nd PU physics exams. :)


  14. Guess this has been answered several times over. Eddy currents formed when the magnet begins to fall. Creates a field that opposes the original magnetic field


  15. shrik
    10
    7
    9

    http://en.wikipedia.org/wiki/Lenz%27s_law – Currents bound inside the atoms of strong magnets can create counter-rotating currents in a copper or aluminum pipe.


  16. Lenz’s law..Induced current’s magnetic field opposes the magnetic field that created it.The thing is a (strong) magnet.


  17. Siddarth Pai

    Lenz’s law

    It generates a magnetic field inside the tube, which opposes its own


  18. SS

    Because of Lenz’s law, the “thing” being a magnet.


  19. Logik
    1
    5
    3

    Some combination of Lenz’s law, eddy currents and existence of two magnetic fields that work against each other slowing down the fall.


  20. Bharath
    4
    2
    4

    Lenz law– “An eddy current is set up in a conductor in response to a changing magnetic field. Lenz’s law predicts that the current moves in such a way as to create a magnetic field opposing the change; to do this in a conductor, electrons swirl in a plane perpendicular to the changing magnetic field.”


  21. aditthya

    kind of meissner effect??


  22. Lenz’s Law.
    Slipping a magnet through a copper tube – take the copper tube and drop a magnet through it (hopefully a strong one, Neodymium or other rare earth magnets work the best). You will notice that the magnet falls very slowly. This is because the copper tube “sees” a changing magnetic field from the falling magnet. This changing magnetic field induces a current in the copper tube. The induced current in the copper tube creates its own magnetic field that opposes the magnetic field that created it.


  23. monopole magnet floats down the tube(this experiment
    shows antigravity & free energy exists)


  24. currents induced by the moving magnet cause a magnetic field that opposes the motion of the magnet. lenz’s law (I think).


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