Magnetic flux through a rectangular loop inside a wire

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SUMMARY

The discussion centers on calculating the magnetic flux through a rectangular loop positioned inside a wire using Ampere's Law and the magnetic flux equation. The participant expresses difficulty in applying Ampere's Law due to the perpendicular orientation of the magnetic field vectors along the loop. A proposed method involves dividing the wire's cross-section into infinitesimal pieces to assess the flux contribution from each segment. The solution emphasizes using Ampere's Law to derive the magnetic field as a function of distance from the wire's axis and integrating to find the total flux through the loop.

PREREQUISITES
  • Understanding of magnetic flux and its calculation using integrals
  • Familiarity with Ampere's Law and its application in magnetic field calculations
  • Knowledge of vector calculus, specifically dot products and line integrals
  • Basic concepts of electromagnetism and magnetic fields around conductors
NEXT STEPS
  • Study the derivation of magnetic fields using Ampere's Law in cylindrical coordinates
  • Learn about the application of integrals in calculating magnetic flux through various geometries
  • Explore the concept of magnetic field lines and their relationship to current-carrying wires
  • Investigate advanced techniques for solving electromagnetic problems, such as the Biot-Savart Law
USEFUL FOR

Students and educators in physics, particularly those focusing on electromagnetism, as well as engineers working with magnetic field applications in electrical systems.

D Nguyen
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Homework Statement


upload_2017-4-14_11-1-44.png


Homework Equations


Magnetic flux = integral(B dot dA)
line integral(B dot ds) = (u_o)(i_enc) (Ampere's Law)

The Attempt at a Solution


I can't see how Ampere's law applies because all of the magnetic field vectors along the loop will be perpendicular to that stretch of loop. The best solution I can think of is to divide the cross section of the wire into infinitesimal pieces and see how much flux through the loop each piece contributes. However, this seem very impractical and I feel like there's a more elegant approach to the problem. Please help me figure out where to start.
 

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Use Ampere's Law to find magnetic field as a function of y, the distance from the axis of the wire. Use this to find the flux through a strip dy of length x located at y on the given rectangular loop. Integrate.
 

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