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Exam PHYSICS 2Bb SPRING 2010 QUIZ 4
Name_Professor S.K. Sinha_ _ _~_ _ _ _ _ _ _ __
MULTIPLE CHOICE. Choose the one alternative that best completes the statement or answers the question.
Figure 26.1
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: 36.0V
40
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The emf and the internal resistance of a battery are as shown.
1) In Figure 26.1, when the terminal voltage Vab is equal to 31.6 V, the current through the battery, including
direction, is closest to:
rl~B
14
A) 1.2 AI from a to b
B) 1.3 A, from b to a
q
1.1 A, from a to b
@.1 A, from bto a
a..s:sLlrne
CIAN'e"
E+o A
+..jOes
f(-orn
-I-~4JL +36/0\1 3/,6V
E) 1.2 A, from b to a
T
LfSL== 414 V
T =: I, I ctf}llflS
Figure 27.1
0"
1S0V
... 0
II
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We choje JirtdtOA cort'tt!:J
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Three light bulbs, A, B, and C, have electrical ratings as follows:
Bulb A - 96 W, 2.0 A
Bulb B - 200 V, 250 W
Bulb C - 120 V, 0.5 A
The three bulbs are connected in a circuit, which is across a 150-V line, as shown. Assume the filament resistances of the
light bulbs are constant and independent of operating conditions.
2)
~re
27.1, the current through bulb B is dosest to:
~75A
\!j ht 61 bs are
C(re.-
q
B) 1.25 A
bq,( Cq I~ 0V\..st-~Isks J (;L nJ tAJe-. neeJ.
V-==-yR
~50::=:~
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j
'R A=-1- YQ
\<-\-'-::::
\6CJJ2..
J.J
L D == IS 12(.. tt ~?v40Jl
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Til. ""
+0 tittJ wh~t-~
~::::TL-R-.:::: V/1<­
q 6::::: Lj ~1< 1\
\
E) 0.85 A
D) LIO A
1.00 A
~f<.I-;: ~
n
"- eJf::::'
'-IF \So -"140..' R~ :;:, \'AP
~
I I
r.
\
i GD
~ -t[40
I){ -\: --------
rID
L>'V~\6oqT~J5
B:::: 120
RB
::::
V
Figure 27.5
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3) In Figure 27.5, the circuit R is a variable resistance. As R is decreased
~ tt st -5 -+'he .fes,-,~<.e c+
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to-kl resis,kulte cLe.crea.$€. 5
~ II dedeases,I2 deereases.
o..s K-.
C!0decreases,I2increases.
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-j.clFIgure 27.10
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Initially, for the circuit shown, the switch S is open and the capacitor voltage is 80 V. The switch S is closed at time t = O.
4)
I~_27.1O,
the charge on the capacitor, when the current in the circuit is 33 flA, in !-le, is closest to:
~
m~
V(+) - \}
o
e,-
q~
-tRc
:>
~B
(fOA
~~
~ -RQ(+)+ 9-~+-~ =0
([ net \Je+):::: QC-B ~ 'RQ(+)
~
T(-8= \1C+1
L
R
33»A -_go e-+/RC
d/D
=)
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Q C+)::: 0. 0 e- fit<c.;::::.
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e --tkc.
33 ~~~Z,c.?
--~-
80
c.. V"e -+lac,
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