Conductance takes place in a waveguide:

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Multiple Choice

Conductance takes place in a waveguide:

In a waveguide, energy is carried by electromagnetic fields that exist inside the guide and are supported by the conducting walls. The metal walls impose boundary conditions that create surface currents and charges, shaping the electric and magnetic field distribution. The combination of these electromagnetic fields flows along the axis of the guide, and the energy transfer is described by the Poynting vector pointing down the length of the waveguide. The boundary fields on the walls—the electric field terminating on surface charges and the accompanying magnetic field looping around the currents—are what enable the wave to propagate, i.e., to conduct power along the guide. This is why the correct statement is that conductance occurs through electromagnetic and electrostatic fields in the walls of the waveguide.

In a waveguide, energy is carried by electromagnetic fields that exist inside the guide and are supported by the conducting walls. The metal walls impose boundary conditions that create surface currents and charges, shaping the electric and magnetic field distribution. The combination of these electromagnetic fields flows along the axis of the guide, and the energy transfer is described by the Poynting vector pointing down the length of the waveguide. The boundary fields on the walls—the electric field terminating on surface charges and the accompanying magnetic field looping around the currents—are what enable the wave to propagate, i.e., to conduct power along the guide. This is why the correct statement is that conductance occurs through electromagnetic and electrostatic fields in the walls of the waveguide.

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