I-Phys_205-final-April-24-2008-solutions-proof - Phys 205...

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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 6 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 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
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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? a. 53 mC b. 27 mC c. 40 mC d. 80 mC e. 39 mC 1.5 What is the resistance of a wire made of a material with a resistivity of  m   10 2 3 8 × - .  if  its length is 2.5 m and its diameter is 0.50 mm? a. 0.16  b. 0.10  c. 1.28  d. 0.41  e. 0.81  1.6 When a 20-V emf is placed across two resistors in series, a current of 2.0 A is present in  each of the resistors. When the same emf is placed across the same two resistors in  parallel, the current through the emf is 10 A. What is the magnitude of the greater of the  two resistances? a.
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This note was uploaded on 11/26/2010 for the course PHYS 205 taught by Professor Valterzazubuv during the Spring '10 term at Concordia University Irvine.

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I-Phys_205-final-April-24-2008-solutions-proof - Phys 205...

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