An electron in a tv crt moves with a speed of

An electron in a TV CRT moves with a speed of 6.0×107m/s6.0×107m/s, in a direction perpendicular to Earth’s field, which has a strength of 5.0×10−5T5.0×10−5T.

(a) What strength electric field must be applied perpendicular to the Earth’s field to make the electron moves in a straight line?
(b) If this is done between plates separated by 1.00 cm, what is the voltage applied? (Note that TVs are usually surrounded by a ferromagnetic material to shield against external magnetic fields and avoid the need for such a correction.)