A single core cable for use on 11 kV, 50 Hz system has conductor area of 0·645 cm2 and internal diameter of sheath is 2·18 cm. The permittivity of the dielectric used in the cable is 3·5.
Find:-
(i) the maximum electrostatic stress in the cable,
(ii) minimum electrostatic stress in the cable,
(iii) capacitance of the cable per km length and
(iv) charging current.