An infinitely long hollow conducting cylinder with inner radius R / 2 and outer radius R carries a uniform current density along its length. The magnitude of the magnetic field, | B | as a function of the radial distance r from the axis is

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An infinitely long hollow conducting cylinder with inner radius R / 2 and outer radius R carries a uniform current density along its length. The magnitude of the magnetic field, | B | as a function of the radial distance r from the axis is best represented by

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For r < R 2 , B=0 array l For R 2 r < R, B= ₀ 2 [r- R² 2 r ] J array array l For r>R, B= ₀ i 2 r i.e., B 1 r array Hence graph (d) correctly depicts | B | versus r graph.

An infinitely long hollow conducting cylinder with inner radius R / 2 and outer radius R carries a uniform current density along its length. The magnitude of the magnetic field, | B | as a function of the radial distance r from the axis is best represented by

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