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5. lons flow in a circular pipe of radius, a, such that the current density at a radius of rca is given
by: J(r) = Jo 1-
,where r is the distance from the center of the pipe. The current density is
zero outside of the pipe (for r> a). Use Ampere's Law to find an expression for the magnitude of
the magnetic field inside of the pipe, (at a distance, r< a, from the center of the pipe).

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