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Phys_205-final-April-24-2008-2 - Phys 205(Electromagnatism...

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Phys 205 (Electromagnatism), Prof. Georges Abinader Final Exam, Time allotted: 3 hours, April 24, 2008 Work your answers from basic principles, Answer all questions on booklet (including multiple choice questions) Budget your time Simple scientific calculator is allowed The exam has 5 sheets of paper, including the formulae sheet. Return all First and last names: ---------------------------------------------------------- Question 1 (15%): Multiple-choices (1.5 pt each) 1.1 Three point charges, two positive and one negative, each having a magnitude of 20  µ C are placed  at the vertices of an equilateral triangle (30 cm on a side). What is the magnitude of the  electrostatic force on the negative charge? a. 80 N b. 40 N c. 69 N d. 57 N e. 75 N 1.2 A uniform linear charge density of 4.0 nC/m is distributed along the entire  x  axis. Consider a  spherical (radius = 5.0 cm) surface centered on the origin. Determine the electric flux through  this surface. a. 68 N   m 2 /C b. 62 N   m 2 /C c. 45 N   m 2 /C d. 79 N   m 2 /C e. 23 N   m 2 /C
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1.3 A proton ( m  = 1.7  ×  10 –27  kg,  q  = +1.6  ×  10 –19  C) starts from rest at point A and has a speed of  40 km/s at point B. Only electric forces act on it during this motion. Determine the electric  potential difference  A B V V - . a. +8.5 V b. –8.5 V c. –4.8 V d. +4.8 V e. –17 V 1.4 A 20- µ F capacitor charged to 2.0 kV and a 40- µ F capacitor charged to 3.0 kV are connected to each  other, with the positive plate of each connected to the negative plate of the other. What is the final  charge on the 20- µ F capacitor after the two are so connected?
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Phys_205-final-April-24-2008-2 - Phys 205(Electromagnatism...

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