In a circular waveguide with radius r, the dominant mode is TM01 TE01 TM11 TE11

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Question
In a circular waveguide with radius r, the dominant mode is
Options
A. TM₀₁
B. TE₀₁
C. TM₁₁
D. TE₁₁

Correct Answer

TE₀₁

Explanation

Some applications require dual polarization capability. Circular waveguide has this capability.

These analysis uses cylindrical coordinates.

In circular waveguide TE₁₁ mode has the lowest cut off frequency and is the dominant mode.

If D is diameter of waveguide

?_c = 1.706 D for TE₁₁ mode

?_c = 1.029 D for TE₂₁ mode

?_c = 0.82 D for TE₀₁ mode

?_c = 1.306 D for TM₀₁ mode.

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Options
A. becomes a paramagnetic material
B. becomes a very strong ferromagnetic material
C. becomes diamagnetic material
D. none of the above

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Options
A.
B.
C.
D. (e^-b - e^-2b)

7. The number of turns in a coil is doubled. If initial time constant is T, the new time constant is
Options
A. T
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