Physics question, someone please help! Here is the question: Physics question, s

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Physics question, someone please help! Here is the question:

Physics question, someone please help! Here is the question: An electron in a television tube moves with a speed of 5.62 X 10^7 m/s, in a direction perpendicular to the Earth?s field, which has a strength of 5.00 X 10^-5 T. (a) What strength electric field 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 1.05 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.) V

Explanation / Answer

Note that the force due to a magnetic field is

F = q v B

And the force due to an electric field is

F = q E

Thus, as these forces cancel,

q v B = q E

--> E = v B

Thus,

E = 2810 V/m or

E = 2.810 kV/m   [ANSWER]

***************************

Note that

V = E d

Thus, as d = 0.0105 m, E = 2810 V/m,

V = 19.5 V   [ANSWER]

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