sumr97f - £1111 £1111 PHYSICS DEPARTMENT PHY 2005 Final...

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Unformatted text preview: £1111 £1111 PHYSICS DEPARTMENT PHY 2005 Final Exam August, 1997 Name (print): Signature: On my honor, I have neither given nor received unauthorized aid on this examination. 1. Encode your exam number (five—figure number at the top of this page) in spaces 76 thru 80 on the bubble sheet. (1) Yes, 1 have completed this task successfully. (2) (this answer is incorrect) (3) (this answer is incorrect) (4 (5 ) (this answer is incorrect) ) (this answer is incorrect) 2. (A) A laser beam is incident on a glass prism, refractive indeX 1.55, as shown in diagram A. Find the angle of refraction theta. (1) 32.68 degrees (2) 29.68 degrees (3) 26.68 degrees (4) 35.68 degrees (5) 38.68 degrees 3. (A) Parallel light rays from a distant star are incident from the left on lens 1 in figure B. How far from lens 2 is the final image formed by lens 2? (1) lnfinitely far (2) 5 cm (3) 10 cm (4) 20 cm (5) 40 cm 4. (B) An object is placed 25 cm from a converging lens, focal length 10 cm. The image formed is.... (1) real, inverted, diminished (2) virtua l, upright, enlarged (3) virtual, inverted, enlarged (4) virtual, upright, diminished (5) real, upright, enlarged 5. (A) Two 5 nanocoulomb charges are placed at the points (0, 0) and (0, 10 cm). Find the electric field strength at the point (10 cm, 20 cm). (1) 1972 N/c (2) 1572 N/c (3) 2372 N/c (4) 2772 N/c (5) 3172 N/c 6. (B) In figure C, the current through the 23 ohm resistor is 2 A. What is the current through the 37 ohm resistor? (1) 1.16 A (2) 0.84 A (3) 1.45 A (4) 2.76 A (5) 1.24 A 7. (B) A ball of mass 2 grams and net positive charge 7 microcoulombs hangs from a string. The electric field in this region is 2000 N/C, directed vertically upwards. Find the tension in the string. (take 9 : 10 m/s2) (1) 0.006 N (2) 0.020 N (3)0014 N (4) 0.016 N (5) 0.034 N 8. (C) Three resistors, resistances 1 ohm, 2 ohms and 3 ohms are arranged in parallel. Find their equivalent resistance. (1) 0.55 ohms (2) 6 ohms (3) 12 ohms (4) zero (5) 1.83 ohms 41111 9. 10. 11. 12. 13. 14. 15. 21111 (B) 90% of a radioactive sarnple decays away in one day. Find the half—life of the decay. (1) 7.22 hours (2) 5.22 hours (3) 6.22 hours (4) 8.22 hours (5) 9.22 hours (C) A wire carries current in the positive X—direction. There is a magnetic field directed in the positive y—direction. Find the direction of the force on the wire. (1) positive Z—direction (2) negative Z—direction (3) positive X—direction (4) negative X—direction (5) there is no force on the wire (B) The proton in figure D is describing a counterclockwise circle of radius 5 cm at a speed of 1 million rn/s. What are the magnitude and direction of the magnetic field required? (1) 0.2 T into the paper (2) 0.2 T out of the paper (3) 0.3 T into the paper (4) 0.3 T out of the paper (5) 0.7 T to the left (C) A circular loop of wire of radius 3 cm carries a current of 7 amps. What is the strength of the magnetic field it creates at its center? (1) 1.47 Gauss (2) 0.47 Gauss (3) 2.47 Gauss (4) 3.47 Gauss (5) 4.47 Gauss (B) A circular wedding band7 radius 0.8 cm and resistance 5 X 10’6 ohrns7 is rotated from an orientation parallel to the earthls magnetic field to an orientation perpendicular to the earthls magnetic field. This 90 degree rotation takes 0.3 seconds. Find the average induced current flowing in the band. (Take the earthls magnetic field strength to be 0.4 Gauss.) (1) 5.36 mA (2) 4.36 mA (3) 3.36 rnA (4) 2.36 rnA (5) 1.36 rnA (B) The movable wire in figure E is pulled to the right with speed 2 rn/s. What are the magnitude and direction of the resulting induced current? (1) 0.08 A clockwise (2) 0.08 A counterclockwise (3) 0.16 A clockwise (4) 0.16 A counterclockwise (5) the induced current is zero (A) A galvanorneter of resistance 40 ohms displays full scale defiection for a current of 0.02 arnps. To construct an arnrneter with full scale defiection for a current of 10 arnps7 which of the following should be done? (1) Connect it in parallel with a 0.08 ohrn shunt resistance (2) Connect it in series with a 0.08 ohrn rnultiplier resistance (3) Connect it in parallel with a 2000 ohrn shunt resistance (4) Connect it in series with a 2000 ohrn rnultiplier resistance (5) Connect it in parallel with a banana ...
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sumr97f - £1111 £1111 PHYSICS DEPARTMENT PHY 2005 Final...

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