Coaxial Cable

A coaxial cable consists of an outer conductor and an inner conductor separated by an insulating plastic filler.  These two conductors usually carry equal currents in opposite directions.  You may have seen this type of configuration on  cable TV hookups as well as certain types of computer networks.  The above simulation shows the progression of the magnetic fields as many small wires are added to produce a coaxial configuration.

1. Watch the magnetic fields change as the simulation first build the outer conductor followed by the inner conductor.
2. Click drag to measure the field at any point.  Find the current passing through the inner conductor.