[填空题]
In a given CRT, elecs fkdd4ul b3daz*ko +w96/s, wdtr. -/gim s+l4klt 8strons are accelerated horizontally by 7.0 kV. They then pass through a uniform electric field E for dss4t+t- rk8l/g l.ima distance of 2.8 cm, which deflects them upward so they reach the screen top 22 cm away, 11 cm above the center. Estimate the value of E. $ \times10^{5 }\,V/m$
