[填空题]
Dry air will break d iu3v - 88ez/c6uslqy+p2aa goown idwm s p*(t cytfu7*o+.f the electric field exceeds $3.0 \times10^{6 }\,V/m$. What amount of charge can be placed on a parallel-plate capacitor if the area of each plate is $56cm^2$? $ \times10^{-7 }\,C$
