Question

At a frequency equal to cutoff frequeny in a rectangular waveguideflow of electromagneticenrgu will be

Answer 1

Signals can progress along a waveguide using a number of modes. However the dominant mode is the one that has the lowest cut-off frequency. For a rectangular waveguide, this is the TE10 mode. The TE means transverse electric and indicates that the electric field is transverse to the direction of propagation.