Question

The figure at right, consisting of a very closely spaced tubular coil of wire in a circular shape, is called a torus. On this torus TWO possible Amperian loops (labelled 1 and 2) have been drawn.

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(a) Which of the two loops (1 or 2) shown is a good choice to determine the magnetic field strength, B, inside the torus (i.e. the region b ≤ r ≤ c)?

(b) How does the application of Ampere’s Law to loop 2 imply a non-zero magnetic field through the plane of the torus, i.e. through the plane of this page?

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Answer #1

a) Loop 1 is the best choice to determine the magnetic field inside the torus because it enclouses the total current

If number of torus = Nβ.dl u.1 . π (e-リ

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