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3. A long, hollow, cylindrical
conductor with inner radius a and
outer radius b carries a current I
uniformly distributed over the
cross-sectional area of the
conductor (see the figure). (a)Use
Ampere's law to find that the
magnitude of the magnetic field at
radius r from the axis of the
conductor: (a) if r<a; (b) if a<r<b;
(c) if r>b.

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