Electrical Cables
The electrostatic stress in underground cables is

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

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Electrical Cables
Capacitance grading of cable implies

Cables using single dielectric in different concentrations
Capacitance required to be introduced at different lengths to counter the effect of inductance
Use of dielectrics of different permeabilities
Grading according to capacitance of cables per km length

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