Magnetic Field Due To Solid Wire | MCQs

A long straight wire of radius 'a' carries a steady current 'I'. The current is uniformly distributed across its area of cross-section. The ratio of magnitude of magnetic field B₁ at distance a/2 and B₂ at distance 2a from the axis of wire is-

Which of the following graphs correctly represents the variation of the magnitude of the magnetic field outside a straight infinite current carrying wire of radius 'a' as a function of distance 'r' from the center of the wire?