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/ Physics 202—1 ﬂ ’ Examll] ’5’ [/9 M
April 9, 2009 Name: %{7{4’L ‘14:? 7 I. For multiple choice questions, circle the letter in ﬁont of the correct response to the question. 5 points
each.
1. A square loop of wire lies in the plane of this page. An increasing magnetic ﬁeld is directed into the page.
The current in the loop is
' a. zero. at < r n
b. clockwise. K 5" { C»
Q counterclockwise. K ‘4 ‘4 d. clockwise in the left side and counterclockwise in the right side.
e. counterclockwise in the left side and clockwise in the right side. 2. The diagram shows an inductor that is part of a circuit. The direction of the of the induced emf is indicated.
Which of the following is possible? . . 6'
get. the current 15 constant and rightward H
b. the current is constant and leftward. W
e the current is increasing and rightward. ® the current is increasing and leftward.
e. none of the above. 3. An inductance L, resistance R, and an ideal battery of emf 5’ are wired in series. A switch in the circuit is
closed at time 0, at which time the current is zero. At any later time theemf of the inductor is given by
“WM 2*
a. (EIR) (1 7 e”)
b. (ilk) (em)
c. (E/R) (1 + e”)
(cs/R) (1 — e”)
e. (an) (e’R'lL)
4. In a purely capacitive circuit, the current
a. lags the voltage by M: cycle.
b. lags the voltage by V2 cycle. i Q
g leads the voltage by 'A cycle. U5; {fa <1 3 b y J? 0
d. leads the voltage by 1/2 cycle.
e. is in phase with the voltage
5. Light, when going from one medium to another, is bent away from the normal.. From this one may
conclude that f
‘the speed of light has increased in the second medium ‘
d} the light is totally reﬂected. . \
[X c. that the second medium has a higher index of refraction than the ﬁrst. w—~ ~é 3 ... .
d. no change in the speed of light has occurred. L/ I; ‘ g //13
e. the speed of light has decreased in the second medium. 4’3) V
1]. Deﬁnitions and laws. Make your answers brief and t0 the point. If you use an equation as an answer, you must deﬁne all terms. 10 points each. Formally, mathematicall deﬁne the impedance of an AC circuit. .
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 Spring '09
 JOHNMERIWEATHER
 Physics

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