1 n a cathode-ray tube (CRT), an electron travels in a vacuum and enters a regio

Question

1 n a cathode-ray tube (CRT), an electron travels in a vacuum and enters a region between two "deflection" plates which have equal and opposite charges. The dimensions of each plate are L = 11 cm by d = 5 cm, and the gap between them is h = 2.5 mm. (Note: the diagram is not drawn to scale and the direction of the electric field may not be correct, depending on your randomization.) During a 0.001 s interval while it is between the plates, the change of the momentum of the electron What is the electric field between the plates? What is the charge (both magnitude and sign) of the upper plate?

Explanation / Answer

F=deltap/t=-7.2*10^-17/0.001=-7.2*10^-14 N

E=F/q=7.2*10^-14 N /1.6*10^-19=4.5*10^5 j N/C

E=sigma/eo=q/(A*eo)....

charge of the upper plate q=E*A*eo=2.1 uC...upper plate is negative

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