Which effect occurs when a powerful microwave generator exceeds the dielectric breakdown threshold of air?

💡 Explanation

When microwave generator power exceeds dielectric breakdown threshold in air, electrical stress causes ionization, creating a conductive plasma which shorts out or reflects signal within the waveguide because the air's insulating property fails. Plasma formation thus results, rather than frequency shifting, harmonic distortion, or overheating, requiring different electromagnetic phenomena.

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