[单选题]
A parallel-plate capacitor hatk vn*7y f4rynt0+0sc 6o .cooq 4dip8s plat1xi;,fe8swxb+o ( dgdfxu).r.( j kemes of area $0.20 \; m^{2}$ separated by a distance of 1.0 mm. What is the strength of the electric field between these plates when this capacitor is connected to a 6.0-V battery?