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← ScienceWhich risk increases when a dielectric-filled capacitor endures sustained overvoltage?
A)Dielectric breakdown occurs catastrophically✓
B)Increased radiative heat becomes dominant
C)Charge carrier mobility greatly diminishes
D)Quantum tunneling through device increases
💡 Explanation
Sustained overvoltage causes dielectric polarization beyond its design limit; this induces dielectric breakdown because the electric field exceeds material strength. Therefore catastrophic failure occurs rather than gradual degradation, where breakdown voltage thresholds were not superseded.
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