for dry air at a temperature of 0 c and at 1 atm of pressure, electric breakdown occurs when the air is subjected to an electic field with amplitude above about 3 mV/m.
Added by Diego N.
Step 1
- This value is orders of magnitude too small. The standard breakdown field for air at room conditions is on the order of a few million volts per meter (MV/m), not millivolts per meter. Show more…
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The breakdown field strength at which dry air loses its insulating ability and allows discharge to pass through is E = 3x10^6 V/m. At this field strength, the electric energy density is:
Sufiyan A.
Dry air will support a maximum electric field strength of about 2.0 x 10^8 V/m. Above that value, the field creates enough ionization in the air to make the air a conductor. This allows a discharge or spark that reduces the field. What, then, is the maximum voltage between two parallel conducting plates separated by 3.5 cm of dry air?
Mayukh B.
Air at atmospheric pressure breaks down at a stress of approximately 3 kV/mm. Consider the following configurations and estimate the voltage where breakdown (or corona) starts: - A 200 mm gap between two uniform field electrodes. (600 kV) - A 200 mm gap between two 20 mm radius parallel cylinders. (261.6 kV) - A 200 mm gap between two 20 mm radius spheres. (109.1 kV) Comment on the difference of the answers obtained.
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