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The dielectric strength of air is 3.0 xx...

The dielectric strength of air is `3.0 xx 10^6 V/m`. A parallel-plate air-capacitor has area `20 cm^2` and plate separation `0.10 mm`.Find the maximum rms voltage of an AC source which can be safely connected to this capacitor.

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`:.` Maximum voltage,`V_(0) =E xx d`
`= 3 xx 10^(5) xx 10^(-3) = 300 V`
Maximum r.m.s. voltage ` = (v_(0))/(sqrt2) = (300)/(1.414)`
`= 212.2 V`
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