Electrical Cables
The disadvantage with paper as insulating material is

It has high capacitance
None of the listed here
It is an organic material
It is hygroscopic

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

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

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