Which consequence results when atmospheric water contamination reduces the dielectric strength of a high-voltage direct current (HVDC) insulator coated with magnesium oxide?

💡 Explanation

Increased surface conductivity occurs because adsorbed water undergoes autoionization, forming mobile ions via ionic conduction along the MgO surface and interfaces. Therefore conductivity increases, rather than other electrical properties because the adsorbed water facilitates ion transport but not bulk polarization or magnetic ordering.

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