The maximum electric field that can be held in air without producing ionization of air is $10^7\,V/m$. The maximum potential,therefore,to which a conducting sphere of radius $0.10\,m$ can be charged in air is:
- A$10^9\,V$
- B$10^8\,V$
- C$10^7\,V$
- D$10^6\,V$
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