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please solve all options a and b step by step

4- Applied voltage to the single core cable is equal to 250kV and Cross section area of the cable is 12.56
cm?
a. Calculate the diameter of the cable (r1), and insulation thickness (r2-r1).
b. Calculate the Emax, Esctisa, Eisolatione
250 Kv
12,56cm

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