Discussion
The dielectric strength of a material is 20 MV/m. The minimum thickness for 11 kV, with no safety factor, is
Answer: C
Dividing gives \( 11 \times 10^{3}/(20 \times 10^{6}) = 5.5 \times 10^{-4} \) m. In practice a factor of several times this would be used, to allow for voids, ageing, surges and the reduction of strength with time under stress.
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