[填空题]
Two parallel plates, connectesisdaj/s 1 --qd tovf*.*+.3n,tashfzbl 0parm0 x k8sp jr6s ti) a 200-V power supply, are separated by an air gap. How small can the gap be if the air is not to become condu0k6hpi.fb+xst*rf3t)laj8mp *v r0 asnz.s,cting by exceeding its breakdown value of $E\,=3 \times10^{ 6}\,V/m$? $ \times10^{-5 }\,m$
