(adsbygoogle = window.adsbygoogle || []).push({}); 1. The problem statement, all variables and given/known data

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.

2. Relevant equations

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

3. 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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# Magnetic Field in a Toroid

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