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Assertion: a thin void in solid insulation is where breakdown begins. Reason: the field in the void is higher than in the surrounding solid.

  • A.the assertion is false although the reason offered is a true statement in itself
  • B.both the assertion and the reason are true and the reason explains the assertion
  • C.both the assertion and the reason are true but the reason does not explain the assertion
  • D.the assertion is true but the reason given for it is false

Answer: B

The flux density is continuous across the void, so the field there is higher by the ratio of the permittivities, and air is weaker than the solid besides. Both effects act the same way, which is why voids are the chief enemy of high voltage insulation.

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