In waveguide the impossible mode of transmission is ______Select one:a. TE and TMb. TEc. TMd. TE or TM

To answer this question, let's analyze the modes of transmission in a waveguide.

Understanding Waveguide Modes

1. Transverse Electric (TE) Mode: In TE modes, the electric field is entirely transverse to the direction of propagation, meaning there is no electric field component in the direction of wave propagation.

2. Transverse Magnetic (TM) Mode: In TM modes, the magnetic field is entirely transverse to the direction of propagation, with no magnetic field component in the direction of wave propagation.

3. Hybrid Modes: In addition to the TE and TM modes, some structures can support hybrid modes that contain non-zero components in both electric and magnetic fields.

Identifying the Impossible Mode

• In practical applications, both TE and TM modes can exist in a waveguide.
• However, there are situations, particularly in certain configurations of waveguides, where one of the modes may not be supported.

Conclusion

The impossible mode of transmission in a waveguide is specifically the mode that cannot exist under certain conditions. Thus, the answer to the question is:

Final Answer

d. TE or TM (as both cannot exist simultaneously in certain scenarios).