A current i is uniformly distributed over the cross section of a long hollow cylinderical wire of inner radius `R_1` and outer radius `R_2`. Magnetic field B varies with distance r form the axis of the cylinder is

A long straight wire of a circular cross-section (radius a) carries a steady current I and the current I is uniformly distributed across this cross-section. Which of the following plots represents the variation of magnitude of magnetic field B with distance r from the centre of the wire?

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

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 magntic fields B and B' at radii distance (a)/(2) and 2a respectively, from the axis of the wire is

A long straight conducting solid cylindrical wire of radius R carries a steady current / that is uniformly distributed throughout the cross section of the wire. Choose the correct graph of magnetic field B versus r (where r is distance from the axis of the wire)

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

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

A long straight wire of radius 10mm carries a current uniformly distributed over its cross section. The ration of magnetic fields due to the wire at distance of 5mm and 15 mm, respectively from the axis of the wire is