21 A long straight wire of radius a carries a steady current

Last updated: 6/14/2023

21 A long straight wire of radius a carries a steady current I The current is uniformly distributed over its cross section The ratio of the magnetic fields B and B at radial distances and 2 a respectively a 2 from the axis of the wire is b 1 c 4 a 1 2 d NEET 2016 1 4