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Questions

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CUET

Q11. A long straight wire of circular cross section with radius 'a' carries steady current 'I' which is uniformly distributed across the cross-section. The magnetic field in the region r < a and r > a is represented by: (a) B (graph shows B increasing linearly from 0 at r=0 to a max at r=a, then decreasing as 1/r for r>a) (b) B (graph shows B constant for r<a, then decreasing as 1/r for r>a) (c) B (graph shows B decreasing linearly from a max at r=0 to 0 at r=a, then decreasing as 1/r for r>a) (d) B (graph shows B constant for r<a, then constant for r>a)