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The dielectric strength of a material is

  • A.the mechanical stress it can bear without cracking
  • B.the energy it can store per unit volume before failure
  • C.the field it can withstand before breaking down
  • D.the relative permittivity it exhibits at power frequency

Answer: C

It is quoted in kilovolts per millimetre or megavolts per metre, and it sets the minimum thickness of insulation for a given working voltage. Air manages about three megavolts per metre and good solid insulants ten times that or more.

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