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An infinitely long wire with a current I flowing in it is located in the boundary plane between two non-conducting media with permeabilities μ1 and μ2. Find the modulus of the magnetic induction vector throughout the space as a function of the distance r from the wire. It should be borne in mind that the lines of the vector B are circles whose centres lie on the axis of the wire.

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The lines of the B as well as H field are circles around the wire. Thus

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