MHT CET 2025 Physics question
A long straight wire of radius ‘r’ carries a steady current ‘I’. The current is uniformly distributed over its cross-section. The ratio of the magnetic field ‘B’ and ‘B’ at radial distances ‘’ and ‘3r’ respectively, from the axis of the wire is
Answer: (B)
Solution
Inside the wire (distance ), Ampere's law with uniform current density gives . At : . Outside the wire (): ; at $d =
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