An electron in a television tube moves with a speed of 6.38 107 m/s, in a direct

Question

An electron in a television tube moves with a speed of 6.38 107 m/s, in a direction perpendicular to the Earth's field, which has a strength of 5.00 10-5 T. Show all work.

a)What strength electric field must be applied perpendicular to the Earth's field to make the electron move in a straight line in kV/m?

b) If this is done between plates separated by 1.05 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.)

Explanation / Answer

a. apply E = Bc

E = 5e-5 *6.38e7

E = 3.19 KV/m
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E = V/d

V = Ed = 3190* 0.0105 = 33.495 Volts

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