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A single core underground cable with conductor diameter of 3 cm and insulation of diameter 8.5...

A single core underground cable with conductor diameter of 3 cm and insulation of diameter 8.5 cm. The insulation consist of two materials having relative permittivity of 5 and 3 with corresponding safe working electrical stresses of 38 KV/cm and 26 KV/cm. Calculate:
(a) the radial thickness of the insulating layers.
(b) safe working voltage of the cable.

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