[填空题]
An electron is accelerawn huhqx(k/uhr-:+ .p ted horizontally from rest in a television picturem hm-c0ndt7d, tube by a potentiad7,t dcm-0 nmhl difference of 5500 V. It then passes between two horizontal plates 6.5 cm long and 1.3 cm apart that have a potential difference of 250 V (Fig. 17–31). At what angle $\theta$ will the electron be traveling after it passes between the plates? $^{\circ}\,$
