[填空题]
Two parallel plates, connected to a 200-V power supplakl2/z/qw*y qyn 6 j,uy, are separated by l.4xh0z;k)xg-z. otztq7gjl an air gap. How small can th zz4gtxl-ozgk; ) .xtqlj.70he gap be if the air is not to become conducting by exceeding its breakdown value of $E\,=3 \times10^{ 6}\,V/m$? $ \times10^{-5 }\,m$
