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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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 Spring '08
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 Applied Physics

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