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What makes North Pole superior?

  1. Oct 4, 2013 #1
    In an AC generator, the side of the coil which cuts magnetic flux link from the north pole first becomes the live wire. Is there any reason behind that or is it just a natural phenomena?

    Thanx in advance...
     
  2. jcsd
  3. Oct 5, 2013 #2

    Simon Bridge

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    It's an arbitrary convention. You could easily do it the other way around.

    Aside:
    By "north pole" you mean the north-seeking pole of a magnet.
    The "North Pole" is the place on the Earth's surface where the star Polaris is directly overhead
    ... this is close to the Earth's magnetic south pole.

    The North-seeking poles of magnets are treated as special because of their relationship to Polaris and use in navigation. It's like the preference for a right-handed rectangular coordinate system.
     
  4. Oct 5, 2013 #3
    How could it be a convention? If you place a tester at the neutral socket of any plug point in your home, you won't find it glowing.... This simply shows that in reality (or by nature), north pole (of the magnet) is being considered superior. Anyway, I would like to know how you can easilydo it the other way round.

    Thanx...
     
  5. Oct 5, 2013 #4

    Drakkith

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    Both the live and neutral wires carry full current. Neither pole of the magnet is intrinsically better than the other.
     
  6. Oct 5, 2013 #5
    Again... if you place a tester at the neutral socket, it won't glow...
     
  7. Oct 5, 2013 #6

    Nugatory

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    Are you thinking in terms of a North American 110v outlet? If so, the neutral isn't connected to the power source at all, it's connected to ground so of course it doesn't light the tester. To see the symmetry between current generated by cutting the north field lines and the south field lines you have to use a North American 240v outlet, both of whose legs will test hot.
     
  8. Oct 5, 2013 #7

    ZapperZ

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    Testing this out of a household socket introduced other variables, such as what Nugatory has said. Why not make your own coil, connect it to a loop of wire, and then stick a bar magnet in and out? Test this for yourself!

    Zz.
     
  9. Oct 5, 2013 #8

    Simon Bridge

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    Where a neutral (household) wire tests zero, it is by convention - the household wiring, and probably the tester itself, is designed that way because of industrial regulation.

    As the others have said: not a fair test.
    Test an actual generator that you control.
     
    Last edited: Oct 5, 2013
  10. Oct 5, 2013 #9
    Do you have a link or reference for this? What type of generator are you talking about?
     
  11. Oct 5, 2013 #10

    Simon Bridge

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    ... because - imagine you switched off the generator and it spins down so the other part of the coil is the first to cut the north pole ... does that mean you have to go around and recolor all the wires? Or do you have to hand crank the loop around so it's the same again as it was last time?
     
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