Question: An infinitely long, thick cylindrical shell of inner radius a and outer radius b carries a current I uniformly distributed across a cross section of

An infinitely long, thick cylindrical shell of inner radius a and outer radius b carries a current I uniformly distributed across a cross section of the shell.
(a) On a sketch of a cross section of the shell, draw some magnetic field lines. The current flows out of the page. Consider all regions ( r ‰¤ a, a ‰¤ r ‰¤ b, b ‰¤ r ).

(b) Find the magnetic field for r > b.

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