With electromagnetic-coupled lines, how is the magnetic field of the energized line characterized?

The magnetic field of energized electromagnetic-coupled lines is accurately characterized as resembling an air core transformer. This analogy comes from the way in which these lines operate based on electromagnetic induction, where one circuit generates a magnetic field that influences another nearby circuit.

In essence, the energized line generates a magnetic field that surrounds it, similar to how an air core transformer functions, where energy is transferred through a magnetic field without the presence of a physical core. This is crucial in understanding how signals are transmitted across coupled lines, as the strength and configuration of the magnetic field significantly affect the coupling and the efficiency of energy transfer between the lines.

The other options do not correctly apply to the characterization of the magnetic field in this context. A capacitor refers to a device that stores electrical energy temporarily in an electric field, which is unrelated to the magnetic field dynamics in electromagnetic coupling. A battery is used to store and provide electrical energy, but does not describe the transient interactions seen in electromagnetic coupling. A resistor, on the other hand, functions to impede current flow and convert electrical energy into heat, which is not indicative of the magnetic field properties of the energized line. This understanding of the air core transformer model is essential for analyzing and designing systems that utilize electromagnetic coupling, such