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Unformatted text preview: sanchez (es25396) Homework 2 Stone (13730) 1 This print-out should have 26 questions. Multiple-choice questions may continue on the next column or page find all choices before answering. 001 (part 1 of 3) 10.0 points A proton is released from rest in a uniform electric field of magnitude 40000 V / m di- rected along the positive x axis. The proton undergoes a displacement of 0 . 5 m in the di- rection of the electric field as shown in the figure. The mass of a proton is 1 . 672623 10- 27 kg. + + + + + + + + + + + + +------------- v A = 0 + . 5 m v 40000 V / m A B Find the change in the electric potential if the proton moves from the point A to B . Answer in units of V. 002 (part 2 of 3) 10.0 points Find the change in potential energy of the proton for this displacement. Answer in units of J. 003 (part 3 of 3) 10.0 points Apply the principle of energy conservation to find the speed of the proton after it has moved . 5 m, starting from rest. Answer in units of m / s. 004 (part 1 of 4) 10.0 points A parallel-plate, air-gap capacitor has a ca- pacitance of 0 . 1 F. The plates are 0 . 6 mm apart. The permittivity of free space is 8 . 85 10- 12 C 2 / N m 2 . What is the area of each plate? Answer in units of m 2 . 005 (part 2 of 4) 10.0 points What is the potential difference if the capac- itor is charged to 3 . 2 C? Answer in units of V. 006 (part 3 of 4) 10.0 points What is the stored energy? Answer in units of J. 007 (part 4 of 4) 10.0 points How much charge can the capacitor carry be- fore dielectric breakdown of the air between the plates occurs? Answer in units of C. 008 10.0 points Which of the following capacitors, each of which has plates of area A , would store the most charge on the top plate for a given po- tential difference V ? 1. b V d Glass 2. b V d Vacuum 3. b V d/ 2 Vacuum 4. b V d/ 2 Air sanchez (es25396) Homework 2 Stone (13730) 2 5....
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This note was uploaded on 07/30/2009 for the course PHYS 1301 taught by Professor Guevara during the Spring '09 term at Texas A&M.
- Spring '09