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Unformatted text preview: pan (zp695) – Final exam practice – chiu – (56565) 1 This print-out should have 28 questions. Multiple-choice questions may continue on the next column or page – find all choices before answering. 001 10.0 points An electron and a proton are placed at locations A and B respectively. At time t = 0, the electron begins to accelerate as shown, with the magnitude of acceleration being a . If e and m p are the charge and mass of a proton, r is the distance between A and B , θ is the angle shown in the figure and c is the speed of light, what will be the magnitude and direction of acceleration of the proton a moment after the electromagnetic waves from the electron reach B ? Note: Vector vectorr has magnitude r and di- rection pointing from A to B . Ignore the electrostatic force between the electron and the proton 1. 1 4 πǫ e 2 a cos θ m p c 2 r , parallel to vectora 2. 1 4 πǫ e 2 a sin θ m p c 2 r , parallel to vectorr 3. 1 4 πǫ e 2 a sin θ m p c 2 r , perpendicular to vectora 4. 1 4 πǫ e 2 a sin θ m p c 2 r , perpendicular to vectorr 5. 1 4 πǫ e 2 a cos θ m p c 2 r , parallel to vectorr 6. 1 4 πǫ e 2 a cos θ m p c 2 r , perpendicular to vectora 7. 1 4 πǫ e 2 a cos θ m p c 2 r , perpendicular to vectorr 8. 1 4 πǫ e 2 a sin θ m p c 2 r , parallel to vectora 002 10.0 points Two long sheets of width L = 2 . 2 cm each contain N = 220 closely-packed wires car- rying current I = 12 μ A in opposite direc- tions. The sheets are separated by a distance h = 174 μ m. Letting the positive x-direction be to the right, calculate the magnitude of vector B at point A located y = 48 μ m above the exact center of the lower sheet. Answer in units of T 003 (part 1 of 2) 10.0 points The switch below is initially set at position b . There is no charge nor current around the right loop while at position b . At t = t the switch is set to position a . L R C E S b a c d What is the potential difference V dc ≡ V c − V d across the resistor R at t = t ? 1. V dc = ∞ 2. V dc = 0 3. V dc = E e − 1 4. V dc = E (1 − e − 1 ) 5. V dc = −E pan (zp695) – Final exam practice – chiu – (56565) 2 6. V dc = −E e − 1 7. V dc = E 8. V dc = −E (1 − e − 1 ) 9. V dc = −∞ 10. V dc = E e 004 (part 2 of 2) 10.0 points After a long time at position a , the switch is set back to position b . Denote this time as t = 0. What is the maximum energy stored in the capacitor, expressed in terms of L , E , and R ? (Hint: Use conservation of energy.) 1. U max = 1 2 L E R 2. U max = L parenleftbigg E R parenrightbigg 2 3. U max = 1 2 L E R 2 4. U max = L E R 2 5. U max = L E R 6. U max = L E 2 R 7. U max = 1 2 L parenleftbigg E R parenrightbigg 2 8. U max = 1 2 L E 2 R 9. U max = 1 2 L 2 parenleftbigg E R parenrightbigg 2 10. U max = L 2 parenleftbigg E R parenrightbigg 2 005 (part 1 of 2) 10.0 points A very long glass rod of length 2 R carries a uniformly distributed charge + q as shown in the figure. A very large plastic disk of radius R , carrying a uniformly distributed...
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This note was uploaded on 02/21/2012 for the course PHY 303K taught by Professor Turner during the Spring '08 term at University of Texas.
- Spring '08