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← ScienceWhich outcome occurs when high humidity reduces surface resistance of ionic compound insulator supporting high-voltage conductor?
A)Surface arcing across the insulator✓
B)Bulk breakdown of the insulator volume
C)Electrode corrosion from galvanic coupling
D)Increased capacitance to ground network
💡 Explanation
When humidity increases and reduces surface resistivity across an ionic compound insulator, surface arcing can occur since the moist layer conducts electricity, initiating a discharge across the insulator surface. Therefore surface arcing results, rather than bulk breakdown, corrosion, or capacitance increase which need different conduction mechanisms.
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