[填空题]
Two parallel plates, connzd: m(29-cn f5dinvmcected +kkt ovs*0q6kj1a/bh to a 200-V power supply, are separated by an air gap. How small can the gap be if the air is not to become conducting by exceeding it 6+k1k 0qtj*asb/kh ovs breakdown value of $E\,=3 \times10^{ 6}\,V/m$? $ \times10^{-5 }\,m$
