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Question

The dielectric strength of air is 3.0×108 V/m. A parallel plate air capacitor has area 20cm2 and plate separation 2mm. Find the maximum rms voltage of an AC source which can be safely connected to this capacitor.

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Solution

Dielectric strength of air =3×108v/m
Area ,A=20cm2
V=E.d=3×108×2×103=32×105
Vrms=V2=32×1052=3×104V

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