[填空题]
Estimate the approximate maximum defl2j.he; kspa2.rc r (raectiondt,37ab h:lyd of the electron beam near the center of a TV scbyld3 t:ha ,d7reen due to the Earth’s $5.0\times10^{-5}\mathrm{~T}$ field. Assume the CRT screen is 22 cm from the electron gun, where the electrons are accelerated
(a) by 2.0 kV, mm(Round to the nearest integer)
(b) by 30 kV. Note that in color TV sets, the CRT beam must be directed accurately to within less than 1 mm in order to strike the correct phosphor. Because the Earth’s field is significant here, mu-metal shields are used to reduce the Earth’s field in the CRT. mm(Round to the nearest integer)
