How to Calculate Magnetic Field in a Toroid Using Ampere's Law?

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SUMMARY

The discussion focuses on calculating the magnetic field inside a toroid using Ampere's Law, specifically for a toroid with 850 turns, an inner radius of 3.00 cm, and an outer radius of 7.00 cm. The formula derived is B = μ₀ * N * I / (2 * π * R), where R is the radius at which the magnetic field is being calculated. The inner and outer radii help define the toroidal coil's geometry but do not directly affect the magnetic field calculation, as the radius R can be any value between the two. The final expression for the magnetic field is confirmed as μ₀ * 850 * I / (2 * π * R).

PREREQUISITES
  • Understanding of Ampere's Law and its application in magnetism
  • Familiarity with the concept of toroidal coils
  • Basic knowledge of magnetic field calculations
  • Proficiency in using mathematical constants such as π and μ₀
NEXT STEPS
  • Study the derivation of Ampere's Law in different geometries
  • Learn about the properties of toroidal inductors and their applications
  • Explore the relationship between current, turns, and magnetic field strength in coils
  • Investigate the effects of varying the radius on the magnetic field in toroids
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Students studying electromagnetism, physics educators, and engineers working with magnetic field applications in toroidal systems.

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Homework Statement



Use Ampere’s law to calculate the magnetic field inside of a toroid with 850 turns. The inner radius of the rectangular coils is 3.00 cm, the outer radius is 7.00 cm.

Homework Equations



ampere's law: path integral(B*ds) over a closed path is equal to the enclosed current times mu_0

The Attempt at a Solution



by ampere's law for toroids, I get B= mu_0*N*I/(2*pi*R)
Im confused as to what the inner and outer radius have to do with this problem,
hence the cry for help :(
anyone ?
 
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The two radii are there so you can determine the axis of toroidal coils. This is chosen as it simplifies Amperes circuital law to the equation you have stated.
 
so basically these numbers don't really matter, right ?
since I am finding the magnetic field inside the toroid, its just going to be r as an arbitrary length from the center to some point inside (between 3 and 7 cms) ...correct ?

if so, then the final solution is mu_0*850*I/(2*pi*R), right ?
 
so from that explanation, I got that since inner radius is 3 and outer is 7, then radius of the rectangular cross-section is 4/2=2
so r=3+2=5

thats about as much as I could get from that page, please let me know If I am still missing something...
 
That should be ok.
 

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