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Magnetic field due to current

  1. May 12, 2016 #1
    Question-
    Two proton beams going in the same direction repel each other whereas two wires carrying current in the same direction attract each other. Why does this happen?
    Attempt at the solution-
    Two proton beams should be equal to two currents in the same direction then why are we getting two different results?
     
  2. jcsd
  3. May 12, 2016 #2

    TSny

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    For the case of two wires, are the wires electrically charged?
     
  4. May 12, 2016 #3

    berkeman

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    There is a difference between a beam of protons (or electrons) and a current in a wire. Can you think of what the difference is?
     
  5. May 12, 2016 #4
    The wires are not charged as electrons are continuously flowing through them. The only difference between the two cases is that in one case electrons are enclosed in a conductor and in the other they aren't.
    I find this question too confusing. What is the reason?
     
  6. May 12, 2016 #5

    TSny

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    OK, so each wire has essentially zero net charge. What about the proton beams?
     
  7. May 12, 2016 #6
    The protons are continuously flowing without any obstruction in the beam as well. So I think the net charge on the beam should be zero too. Please correct me if I'm wrong.
     
  8. May 12, 2016 #7

    TSny

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    A proton beam is just a stream of protons. Does each proton carry any net charge?
     
  9. May 12, 2016 #8
    Yes each proton carries a net charge.But so does an electron. So if the stream of moving protons is considered charged, applying the similar logic the wire should also be considered charged. Is there any difference in the two cases?
     
  10. May 12, 2016 #9

    TSny

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    What type of electrically charged particles are inside a piece of wire?
     
  11. May 12, 2016 #10
    Electrons, which are flowing just the same way as in a beam
     
  12. May 12, 2016 #11

    TSny

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    Only electrons? Any other type of electrically charged particles inside the wire (that are not flowing)?
     
  13. May 12, 2016 #12
    Oh! I think I got your point. Beams have a net charge as they have only let's say electrons . so they repel due to electrostatic force. Whereas a wire is neutral due to the presence of both electrons and protons. So they is no electrostatic repulsion. Only attraction exists due to moving electrons and the magnetic field of the other wire.
    Please point out my errors if any.
    And one more question. Does the force of repulsion between the beams overpower the attraction due to magnetic field in between the beams resulting in net repulsion?
    Thanks in advance!
     
  14. May 12, 2016 #13

    TSny

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    That's correct.
    Yes. Good.
     
  15. May 12, 2016 #14
    Thank you so much for helping me figure out the answer myself!!
     
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