1. Limited time only! Sign up for a free 30min personal tutor trial with Chegg Tutors
    Dismiss Notice
Dismiss Notice
Join Physics Forums Today!
The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

Help Please: Is it possible to make an electromagnet w 2 like ends?

  1. Mar 3, 2015 #1
    HELP!

    Is it possible to create an electromagnet with one continuous wire with 2 like poles (i.e. both ends either north or south)?.

    Visualising it with the right hand screw rule for current carrying coils, it will be like the picture below, but one end of the coil will be as shown, while the other end of the electromagnet will be coiled in the other direction as dictated by the right hand screw rule pointing to the right, to give both extreme ends North, with 2 South pole ends in the middle.

    Right-Hand-Grip-Rules2.png

    Right now in my head it seems possible to create this kind of electromagnet, given that i can find a way to keep the coils from messing up when a current passes through it.

    Is this actually possible? What are some complications that you may foresee or ways to make it work if it can't?

    Thank you so much.
     
  2. jcsd
  3. Mar 3, 2015 #2

    Drakkith

    User Avatar

    Staff: Mentor

    Looks to me like you could reverse the direction of the wire as it wraps around at the midpoint. But then you have a very large repulsive force between the two parts of the coil.
     
  4. Mar 3, 2015 #3
    that's what i'm thinking too, but it seems plausible so far
     
  5. Mar 3, 2015 #4

    CWatters

    User Avatar
    Science Advisor
    Homework Helper

    Think about the flux in the centre of the coil. As you bring the two halves together they will tend to cancel each other.
     
  6. Mar 3, 2015 #5

    Vanadium 50

    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor

    You can't have a north pole (or poles) without a south pole somewhere. This is true no matter what kind of magenet you are talking about: permanent, electro-, or hybrid. Once the position of the poles is specified, then one can think about where the wires go.
     
  7. Mar 3, 2015 #6

    Drakkith

    User Avatar

    Staff: Mentor

    I was under the assumption that the south poles would be in the middle and the field would look similar to placing two bar magnets together with their south poles touching.
     
  8. Mar 3, 2015 #7

    Vanadium 50

    User Avatar
    Staff Emeritus
    Science Advisor
    Education Advisor

    You will discover that a "pole" mid-magnet gives you very weak poles at the ends.
     
  9. Mar 3, 2015 #8
    How about with the middle section being a Hallbach Array to keep those "like-poles" in the center from fighting -( can weld and-or anneal as needed in order to maintain or achieve single-mass-lump to minimize magnetic noise & echo due to physical alteration passing through material interfaces), and changing wire-wrap direction in transition over or through Hallbach material. As a side-note, that echo an be used in measurement just as surely as ultrasound showing a pipewall-water interface, if one can catch it on the bounce, a bit like water flowing against main current ;) -- if you wish to study water currents more look up Viktor Schauberger's water work.

    also look into Municipal Solid Waste Separation - using magnets to pull out ferrous materials - and induced eddy-currents to PUSH out aluminum cans etc, a beautiful design and execution

    also look into the hysteresis curves of your materials, find your smoothest transition metals for Hallbach

    if it need not be a single solid unit then maybe try sticking two Hallbach-ed poles end-to-end with whatever pole you want facing out? Think about those 50lb pull cheap magnets from Harbor Freight with their Hallbach latch-plates.

    good luck and happy tinkering
     
  10. Mar 3, 2015 #9
    Thank you all for the responses.

    Can you please elaborate more on why that will happen? My grasp of magnetism isn't that strong. :/
     
Know someone interested in this topic? Share this thread via Reddit, Google+, Twitter, or Facebook




Similar Discussions: Help Please: Is it possible to make an electromagnet w 2 like ends?
Loading...