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Which outcome occurs when a dielectric slab is rapidly inserted into a parallel-plate waveguide?

A)TEM wave velocity changes
B)Wave impedance is unchanged
C)Cutoff frequency remains constant
D)Characteristic mode order decreases

💡 Explanation

Insertion changes the capacitance, which affects wave propagation because a change in refractive index directly leads to an altered TEM wave velocity via Maxwell's relations. Therefore, velocity shifts rather than impedance remaining constant.

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