Which outcome occurs when a microwave oven's magnetron output couples excessively into its supply capacitor?

💡 Explanation

When magnetron output couples excessively into supply capacitor, the high-frequency energy can cause excessive heating and voltage stress which accelerates dielectric degradation, leading to breakdown because dielectric strength is exceeded. Therefore dielectric breakdown results, rather than frequency shift, efficiency increase or harmonic suppression which require different interaction mechanisms.

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