A long straight wire of radius a carries a steady current I. The current is uniformly distributed across its cross section. The ratio of the magnetic field at 2 a and 2 a from axis of the wire is :

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A long straight wire of radius a carries a steady current I. The current is uniformly distributed across its cross section. The ratio of the magnetic field at 2 a ​ and 2 a from axis of the wire is :

TestHub · Accepted Answer

​ B 1 ​ 2 π 2 a ​ = μ o ​ 4 I ​ B 1 ​ = 4 π a μ o ​ I ​ B 2 ​ 2 π 2 a = μ o ​ I B 2 ​ = 4 π a μ o ​ I ​ ​

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