Ha figure is a sectional area of a long coaxial cable. The radius of its metal strands are R1 = 3 mm, R2 = 4mm, r = 2mm, and the currents in them I1 = 15A, I2 = 10 A. Considering that the currents flow in the same direction, to construct a graph of the scale of the magnetic induction field of the distance from the cable axis in = B (r). Determine the magnetic energy stored between the metal conductors of the cable per unit length.

Detailed solution shorthand terms, formulas, laws used in the decision, the withdrawal of the calculation formula and the response.
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