Answers for Assignment 2

Problem #5. In order for the electron to miss the upper plate, theta must satisfy

sin2(theta) < 2 e E d / (me v02)

and if the electron does miss the upper plate, it travels a distance

xf = 2 me v02 sin(theta) cos(theta) / (e E)

Problem #6. Proof.

Problem #7. Py = 2 e yH = 1.86 x 10 -29 C m

Problem #8. Proof.

Problem #9. Proof.

Problem #10. Proof. The working diagram is

Problem #11. PHI = pi R2 E


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Last revised 1998/02/20