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Unformatted text preview: homework 02 FAUSAK, TAYLOR Due: Jan 28 2008, 4:00 am 1 Question 1, chap 23, sect 2. part 1 of 3 10 points A uniformly charged circular arc AB of ra dius R is shown in the figure. It covers a quarter of a circle and it is located in the sec ond quadrant. The total charge on the arc is Q > 0. The value of the Coloumb constant is 8 . 98755 10 9 N m 2 / C 2 . x y + + + + + + + + + R x y I II III IV B A O s R What is the direction of the electric field vector vector E at the origin, due to the charge distribution? 1. along the negative xaxis 2. along the positive yaxis 3. in quadrant III 4. along the positive xaxis 5. along the negative yaxis 6. in quadrant I 7. in quadrant IV 8. in quadrant II Question 2, chap 23, sect 2. part 2 of 3 10 points Find E x , the xcomponent of the electric field at the origin due to the full arc length for the case, where Q = 0 . 8 C and R = 0 . 26 m. Answer in units of N / C. Question 3, chap 23, sect 2. part 3 of 3 10 points If at O we have E x = C , then what is the magnitude of the full force F (not just the xcomponent) on an electron at this point? 1. F = C 2 e 2. F = 2 C 3 e 3. F = C e 2 4. F = C 3 e 5. F = eC 6. F = 3 eC 2 7. F = 2 eC 8. F = 2 eC 9. F = 3 eC 10. F = 4 eC Question 4, chap 23, sect 2. part 1 of 4 10 points Consider a disk of radius 4 . 3 cm, having a uniformly distributed charge of +3 . 6 C. The value of the Coulomb constant is 8 . 98755 10 9 N m 2 / C 2 . Compute the magnitude of the electric field at a point on the axis and 3 . 8 mm from the center. Answer in units of N / C. Question 5, chap 23, sect 2. part 2 of 4 10 points It is interesting to compare this result with the exact answer from the previous question....
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 Spring '07
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