A single core lead sheathed cable with two dielectrics of permittivity 4 and 3, respectively, are subjected to same maximum stress. If the conductor diameter is 1.5 cm, the outer diameter of the first dielectric is
(A) 1.125 cm (B) 1.5 cm (C ) 2 cm (D) 8 cm
(A) 1.125 cm (B) 1.5 cm (C ) 2 cm (D) 8 cm