From Ampere's circuital law for a long straight wire of circular cross-section carrying a steady current, the variation of magnetic field in the inside and outside region of the wire is: [Diagram: A graph showing magnetic field ($\beta$) vs distance (r) from the center of a wire. The field increases linearly up to r=R and then decreases with a 1/r dependence.]

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A linearly increasing function of distance r up to the boundary of the wire and then decreasing one with 1/r dependence for the outside region

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