A long straight wire of a circular cross-section with radius ' a ' carries a steady current I . The current I is uniformly distributed across this cross-section. The plot of magnitude of mag

Question

A long straight wire of a circular cross-section with radius ' a ' carries a steady current I . The current I is uniformly distributed across this cross-section. The plot of magnitude of magnetic field B with distance r from the centre of the wire is given by

TestHub · Accepted Answer

We know inside the wire B = 2 π R 2 μ 0 ​ I ​ ⋅ r And B = 2 π r μ 0 ​ I ​ ​ ( O < r < R ) for ( R < r ) ​

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