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Energy Stored leading to Dielectric breakdown 
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#1
Dec2909, 05:09 AM

P: 33

1. The problem statement, all variables and given/known data
A cavity can only store 1J of EM energy as it reaches dielectric breakdown at 3kV/mm. What dielectric strength would a new gas filling the cavity have if the energy stored was to be 4J. 2. Relevant equations U=[tex]\frac{1}{2}[/tex](epsilon)E^{2} 3. The attempt at a solution I would use the above equation to find the E field that would result in 4J of energy stored. Can anyone tell me if this is the correct approach to answering this question? 


#2
Jan110, 05:22 PM

P: 8

That's the correct approach. The energy scales as the Efield squared, so quadrupling the energy doubles the required Efield, so the gas dielectric must be able to withstand a field of 6 kV/mm without breaking down.



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