A current i is uniformly distributed ove...

A current i is uniformly distributed over the cross section of a long hollow cylinderical wire of inner radius `R_1` and outer radius `R_2`. Magnetic field B varies with distance r form the axis of the cylinder is

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A long straight wire of a circular cross-section (radius a) carries a steady current I and the current I is uniformly distributed across this cross-section. Which of the following plots represents the variation of magnitude of magnetic field B with distance r from the centre of the wire?

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