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In: Electrical Engineering

The inner and outer diameter of a single core cable are 3 cm and 8.5 cm...

The inner and outer diameter of a single core cable are 3 cm and 8.5 cm The insulated with two materials having relative permittivity of 5 and 3.5 respectively with corresponding maximum electric stresses of 35 kV/cm and 25 kV/cm. Draw the configuration and calculate:
a) the radial thickness of each insulating layer.
b) the safe working voltage of the cable.
c) draw the voltage and electric stress as a function of radial distance from center to metal sheath.

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