Unformatted text preview: 77777 77777 1 PHYSICS DEPARTMENT \ PHY 2054 131: Exam Hill, 2006 \\ \Name (print, last ﬁrst): Vt .
$ (t Signature:
01: my honor, I have neither given nor meeined unauthorized aid on this examination. YOUR. TEST NUMBER IS THE 5DIGIT NUMBER AT THE TOP OF EACH PAGE. (9A (1) Code your test number on your answer sheet (use lines 70—80 on the answer sheet for the 5di t 2
3 number). Code your name on your answer sheet. DARKEN CIRCLES COMPLETELY. Code your
number on your answer sheet. Print your name on this sheet and sign it also. Do all scratch work anywhere on this exam that you like. Circle your answers on the test form. At the end of
the test, this exam printout is to be turned in. No credit will be given without both answer sheet and printout. (4) Blacken the circle of your intended answer completely, using a #2 pencil or blue or black ink. Do not make any stray marks or some answers may be counted as incorrect. (5) The answers are rounded off. Choose the closest to exact. There is no penalty tor guessing. If you believe that no listed answer is correct. leave the form blank. (6) Hand in the answer sheet separately. Constants
g=9.80n1/s e=1.6 x 10" C Inc: 10" C
G=6.67x10’ Nm/kg3 m.=9.11x10 kg lnC=10" C
kg=8.99x10 Nm/ m,=m,.=1.67x10‘ kg 1pC==10' C
€0=8.85X10— C/N/m 1e =1.6x10".l c=3x1rm/s 1. 2. Three charges 01 = +5pC, Q2 == —6 C and 3 = +9pC produce an electric ﬁeld of strength E at a point P. All 3
charges are now doubled. Weill—stills &:;E (2)3E (3)4E (4)9E (5)13 Three charges 01 = 3pC, Q; = —6 C and 0;, = +9110 produce an electric ﬁeld of strength E at a point P. All 3
charges are now tripled. The new ﬁel at P is (1) a E (2) 2 E (3) 4 E (4) 9 E (5) E Three charges Q; = +5pC, Q; = —6pC and Q; = +9110 produce an electric ﬁeld of strength E at a point P. All 3
charges are now quadrupled. The new ﬁeld at P is (1) 4 E (2) 3 E (3) 2 E (4) 16 E (5) E . Two identical small insulated conducting spheres, whose centers are L3,!) cm apart, carry charges Q; = ~100uC and Q; = ~2(leC, respectively. The spheres are kept insulated, but you bring them into mutual contact and then you put
them back into their original podtions. How much does the potential energy (in J) between the 2 spheres change how
the initial to the ﬁnal conﬁguration? (1) 119 (2)96 (3) s1 (4) —119 (5) —96 Two identical small insulated conducting spheres, whose centers are 23.4 cm apart, carry charges 01 = ~200uC and
Q; = 100u C, respectively. The spheres are inept insulated, but you bring them into mutual contact and then you
put them back into their original positions. How much does the potential energy (in J) between the 2 spheres change
from the initial to the ﬁnal conﬁguration? (1) 96 (2) 119 (3) 81 (4) —96 (5) —31 Two identical small insulated conducting spheres. whose centers are 27.8 cm apart, carry charges 01 = ~100pC and 2 = ~200pC, respectively. The spheres are kept insulated, but you bring them into mutual contact and then you put
t in back into their original positions. How much does the potential energy (in J) between the 2 spheres change from
the initial to the ﬁnal conﬁguration? ‘ (1)81 (2)96 (3) 119 (4) —119 (5) —81 ...
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 Spring '09
 DUNNAM

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