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Increasing the voltage between conuctors of coaxial cable it is determined that at voltage (U ac ) max =135kV, second dielectric is loosened. Calculate Ɛ r2. a=3mm, b=6mm, c=12mm, Ɛ r1 =8, E s1 =300kV/cm, E s2 =200kV/cm Result: Ɛ r2 =5 Could someone help? Thanks for replies.

Increasing the voltage between conuctors of coaxial cable it is determined that at voltage (Uac)max=135kV, second dielectric is loosened. Calculate Ɛr2.
a=3mm, b=6mm, c=12mm, Ɛr1=8, Es1=300kV/cm, Es2=200kV/cm
 
Result:
Ɛr2=5
 
Could someone help?
Thanks for replies.

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