How Much Voltage Can Insulation Withstand Before Breaking?

[jamz100]

Homework Statement

A conductors in a cable are separated by a .35cm of insulation .

Homework Equations

Calculate the electric field strength within the insulation when the conductor voltage difference is 120v. Also determine the voltage@ which the insulation may break if its dielectric strength is 270kv/cm

The Attempt at a Solution

given
voltage----120v
conductor size ----.35cm
dielectric strength 270kv

 

[misgfool]

Homework Statement

A conductors in a cable are separated by a .35cm of insulation .

Homework Equations

Calculate the electric field strength within the insulation when the conductor voltage difference is 120v. Also determine the voltage@ which the insulation may break if its dielectric strength is 270kv/cm

The Attempt at a Solution

given
voltage----120v
conductor size ----.35cm
dielectric strength 270kv

Well that is an impressive attempt. Field strength can be calculated with a simple formula if we know voltage and distance between the conductors. Even dimension analysis might reveal that formula. Same formula will actually solve the second one too but this time the voltage is the variable.