2010-11-Sem2-Test1 - Page 1 of 11 NATIONAL UNIVERSITY OF...

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Page 1 of 11 Page 1 of 11 NATIONAL UNIVERSITY OF SINGAPORE PC1222 FUNDAMENTALS OF PHYSICS II TERM TEST 1 (Semester II: AY 2010-11, 3 March) Time Allowed: 1.5 Hours (8:15 am – 9:45 am) INSTRUCTIONS TO CANDIDATES 1. This test paper contains TWENTY-FIVE 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, D or E 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; There is NO negative marking. 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.
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Page 2 of 11 Page 2 of 11 1. Five styrofoam balls are suspended from insulating threads. Several experiments are performed on the balls; and the following observations are made: I. Ball A attracts B and A repels C. II. Ball D attracts B and D has no effect on E. III. A negatively charged rod attracts both A and E. What are the charges, if any , on each ball? A) B) C) D) E) 2. At what separation will two charges, each of magnitude 6.0 µ C, exert a force of 0.70 N on each other? A) 1.1 × 10 –5 m B) 0.23 m C) 0.48 m D) 0.68 m E) 1.4 m A B C D E + + 0 + + + + 0 + + 0 0 + 0 0 + 0 + 0
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Page 3 of 11 Page 3 of 11 3. Four point charges are held fixed at the corners of a square as shown in the figure. Which of the five arrows shown below most accurately shows the direction of the net force on the charge –Q due to the presence of the three other charges? The figure shows a parallel plate capacitor. The surface charge density on each plate is 8.8 × 10 –8 C/m 2 . The point P is located 1.0 × 10 –5 m away from the positive plate. 4. What is the magnitude of the electric field at the point P ? A) 8.8 N/C B) 88 N/C C) 1.0 × 10 2 N/C D) 8.8 × 10 2 N/C E) 9.9 × 10 3 N/C 5. If a +2.0 × 10 –5 C point charge is placed at P , what is the force exerted on it? A) 0.2 N, toward the negative plate B) 0.2 N, toward the positive plate C) 5 × 10 4 N, toward the positive plate D) 5 × 10 4 N, toward the negative plate E) 5 × 10 4 N, into the plane of the page
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Page 4 of 11 Page 4 of 11 6. A rigid electric dipole is free to move in the electric field represented in the figure. Which one of the following phrases most accurately describes the initial motion of the
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2010-11-Sem2-Test1 - Page 1 of 11 NATIONAL UNIVERSITY OF...

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