Hi,(adsbygoogle = window.adsbygoogle || []).push({});

I have recently been reading through / self learning some material on Electrostatics and I came across this question.

The minimum electric field that can be supported by dry air at atmospheric pressure is about 10^5 volts/m. What is the maximum potential difference to the earth for a conduction sphere of radius 10cmin air? (Take the distance of the sphere to the earth to infinite).

I can't quite figure out how to approach it. I have tried placing a charge q inside the sphere and then calculating the value of q supposing the electric field on the surface is 10^5 v/m and from that calculating the potential at the surface. However this answer is incorrect and I am out of ideas. Any help would be much appreciated.

Regards,

Lucas

**Physics Forums | Science Articles, Homework Help, Discussion**

Dismiss Notice

Join Physics Forums Today!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

The friendliest, high quality science and math community on the planet! Everyone who loves science is here!

# Homework Help: Electric Breakdown

**Physics Forums | Science Articles, Homework Help, Discussion**