Discussion
A 1 mm air gap lies in series with 4 mm of solid insulation of relative permittivity 4, across 1000 V. The field in the air gap is about
Answer: A
The equivalent electrical thickness of the solid is one millimetre, so the two layers behave as equal capacitances and share the voltage equally: 500 V across one millimetre of air, that is 500 kV/m. Air breaks down at about 3 MV/m, so this gap survives.
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