2010-11-Sem1-Test1 - NATIONAL UNIVERSITY OF SINGAPORE...

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Unformatted text preview: NATIONAL UNIVERSITY OF SINGAPORE PC1222 FUNDAMENTALS OF PHYSICS II TEST 1 (Semester I: AY 2010-11, 30 September) Time Allowed: 1.5 Hours INSTRUCTIONS TO CANDIDATES 1. This test paper contains TWENTY-ONE multiple-choice questions and comprises ELEVEN printed pages including the cover page. 2. Answer ALL questions on the Optical Reader Form. 3. For each question, select the correct answer A, B, C, or D by darkening the appropriate circle on the Optical Reader Form. Darken only ONE circle for each answer; darkening more than one circle will invalidate your answer. 4. All questions carry equal marks. 5. ONLY Optical Reader Form should be submitted at the end of the test. 6. This is a CLOSED book test. You are allowed however to bring in ONE help sheet no larger than A4 in size. Page 2 of 11 1. Topic: Electric Charge Difficulty: Level 1 Sphere A carries a net positively charge and sphere B is neutral. They are placed near each other on an insulated table. Sphere B is briefly touched with a wire that is grounded. Which of the following statement is correct? (A) Sphere B remains neutral. (B) Sphere B is now positively charged. (C) Sphere B is now negatively charged. (D) The charge on sphere B cannot be determined without additional information. 2. Topic: Electric Force Difficulty: Level 1 Two charges, Q 1 and Q 2 , are separated by a certain distance R . If the magnitudes of their charges is halved and their separation is doubled, what happens to the electrical forces between these charges? (A) It decreases by a factor of 2. (B) It decreases by a factor of 4. (C) It decreases by a factor of 8. (D) It decreases by a factor of 16. 3. Topic: Electric Forces Difficulty: Level 2 Three point charges are placed on the x-axis. A charge of + 2 . μ C is placed at the origin,- 2 . μ C to the right at x = 50cm and + 4 . μ C at the 100cm mark. What are the magnitude and direction of the electrostatic force which acts on the charge at the origin? [Coulomb constant k = 9 . 00 × 10 9 Nm 2 / C 2 ] (A) 0 . 072N, left (B) 0 . 072N, right (C) 0 . 216N, left (D) 0 . 216N, right PC1222 Fundamentals of Physics II Semester I, 2010/11 Page 3 of 11 4. Topic: Electric Field Difficulty: Level 1 In a diagram of electric field lines, q 1 has 9 lines going into it and q 2 has 27 lines going out from it. If one of the charges is- 60mC, which of the following could be the other one?...
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This note was uploaded on 11/30/2011 for the course EEE 1001 taught by Professor Phoon during the Spring '11 term at National University of Singapore.

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2010-11-Sem1-Test1 - NATIONAL UNIVERSITY OF SINGAPORE...

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