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flyingpig
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Homework Statement
The magnetic coils of a tokamak fusion reactor are in the shape of a toroid having an inner radius of 0.700 m and an outer radius of 1.30 m. The toroid has 900 turns of large-diameter wire, each of which carries a current of 14.0 kA.
(a) Find the magnitude of the magnetic field inside the toroid along the inner radius.
___T
(b) Find the magnitude of the magnetic field inside the toroid along the outer radius.
___T
The Attempt at a Solution
(a) I did it the way the textbook wants me to and I got 3.6T, but I don't understand, how could there be a current inside the torus? I mean if I were to enlarge my Amperian loop, I can get a current passing through
(b) Same here, if I were to draw an Amperian loop that is bigger than the torus, wouldn't it be zero? BUt the loop is still valid for it encloses the torus right?