Magnetic field created by a wire acts on the wire itself?

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Discussion Overview

The discussion revolves around the interaction of magnetic fields generated by current-carrying wires, specifically whether the magnetic field produced by a segment of wire can affect itself and how this is accounted for in a problem involving a closed loop of wires. The scope includes conceptual understanding and application of magnetic field principles in a theoretical context.

Discussion Character

  • Conceptual clarification, Debate/contested, Homework-related

Main Points Raised

  • One participant questions why the magnetic field generated by the wire segment CD is not included in the calculation of the total magnetic field on segment BA, suggesting that it should interact with itself.
  • Another participant agrees, stating that the exercise does not consider these 'internal' forces as they do not influence the net force on the complete loop ABCD.
  • A later reply reinforces this point, indicating that the problem's answer for the total magnetic field on segment AB neglects the contribution from segment BC.

Areas of Agreement / Disagreement

Participants generally agree that the internal magnetic fields are not accounted for in the problem, but there is a disagreement regarding whether this omission leads to an incorrect result in the provided answer.

Contextual Notes

The discussion highlights potential limitations in the problem's assumptions regarding the influence of internal magnetic fields and their contributions to the overall magnetic forces in the loop.

physics user1
So here is the problem, it asks me to find the total magnetic field on BA, i made a vectorial sum with the magnetic field generated by i1 and by i2 and i got the right result, but why not adding also the magnetic field generated by the wire itself? I mean generated by CD why isn't that correct? There is current i glowing in CD too, so it generates a magnetic field, why doesn't this add too? Basically I am asking: does a wire carriyng current generate a magnetic field that can imteract with that wire?
Please help me
 

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You are correct. The exercise doesn't take these 'internal' forces into account because they don't influence the net force on the complete loop ABCD.
 
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BvU said:
You are correct. The exercise doesn't take these 'internal' forces into account because they don't influence the net force on the complete loop ABCD.
So... if it asks me the total magnetic field on BA and doesn't take under account the field generated by CD the book gave me a wrong result? Thanks
 
I agree. It asks for the total magnetic force on AB and for the total force on CD. The 75.6 ##\mu##T in the answer for AB ignores the field produced by BC (88.4 ##\mu##T)
 
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