Electrical Cables
The electrostatic stress in underground cables is

Zero at the conductor as well as on the sheath
Minimum at the conductor and maximum at the sheath
Same at the conductor and the sheath
Maximum at the conductor and minimum at the sheath

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Electrical Cables
Solid type cables are considered unreliable beyond 66 kV because

Of corona loss between conductor and sheath material
There is a danger of breakdown of insulation due to the presence of voids
Insulation may melt due to higher temperature
Skin effect dominates on the conductor

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