[填空题]
In a given CRT, electrsrql1x8- kdrfci2rz ;5+r ;ukons are acceleratedk6, f9*.a zu:mk z8a5emmnxro horizontally by 7.0 kV. They then pass through a uniform electric field E for a distance of 2.8 cm, which deflects them upward so they reach the sc m9,u.xae6z* nza k o:fkmmr85reen top 22 cm away, 11 cm above the center. Estimate the value of E. $ \times10^{5 }\,V/m$
