[" A long straight wire of radius'a' carries a "],[" steady current i.The current is "],[" uniformly distributed across section.The "],[" ratio of the magnetic field at "a/2" and "2a" is "]

A long straight wire of radius a carries a steady current I. the current is uniformly distributed across it cross-section. The ratio of the magnetic field at a/2 and 2a is

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 magnetis field at (a)//(2) and (2a) is

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 magnetis field at (a)//(2) and (2a) is

A long straight wire of radius carries a steady current I. The current is uniformly distributed over its cross - section. The ratio of the magnetic fields B and B', at a radial distances a/2 and 2a respectively, from the axis of the wire is