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← ScienceWhich outcome occurs when excessive voltage gradients induce dielectric breakdown in underground shielded power cables?
A)Localized plasma discharge initiation✓
B)Increased cable compressive strength
C)Enhanced magnetic field containment
D)Reduced cable inductive reactance
💡 Explanation
Localized plasma discharge is initiated because, when the electric field exceeds the dielectric strength, electron avalanche occurs, triggering ionization within voids. Therefore, a plasma discharge starts, generating heat and further damaging the insulation, rather than improved mechanical or signal integrity under normal usage conditions.
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