Q4 (25 PTS)\ The coaxial cable shown in the figure has two layers of dielectric materials. Assume that the radius of the inner conductor is

2.0cm

and the relative dielectric constants of the layers are

\\\\epsi _(1)=3.2

and

\\\\epsi _(2)=2.6

, respectively.\ Design the cable (determine the outer radius) to work at

50kV

such that the maximum field stresses in the insulating materials should not exceed

25%

of their electric strengths. The dielectric strength of the first material is

E_(1)=250k(V)/(c)m

and and of the second

E_(2)=200k(V)/(c)m

respectively.

The coaxial cable shown in the figure has two layers of dielectric materials. Assume that the radius of the inner conductor is 2.0cm and the relative dielectric constants of the layers are 1=3.2 and 2=2.6, respectively. Design the cable (determine the outer radius) to work at 50kV such that the maximum field stresses in the insulating materials should not exceed 25% of their electric strengths. The dielectric strength of the first material is E1=250kV/cm and and of the second E2=200kV/cm respectively