Question

An electron in a television tube moves with a speed of 6.50 ✕ 107 m/s, in...

An electron in a television tube moves with a speed of 6.50 ✕ 107 m/s, in a direction perpendicular to the Earth's field, which has a strength of 5.00 ✕ 10−5 T.
(a)
What strength electric field (in kilovolts per meter) must be applied perpendicular to the Earth's field to make the electron move in a straight line?
kV/m
(b)
If this is done between plates separated by 1.15 cm, what is the voltage applied (in volts)? (Note that TVs are usually surrounded by a ferromagnetic material to shield against external magnetic fields and avoid the need for such a correction.)
V
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