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Unformatted text preview: n ' ' «J . PHY 122
MARCH 24, PRELIM II a ; . g
2005 J/"' ’ NAME: ‘KU;' §_5“w‘ ﬁg RECITATION SECTION: ’7 “I. READ EACH PROBLEM CAREFULLY.
is being asked, If you do not understand what
raise your hand for assistance. II. SHOW YOUR WORK. Present your answers as a decimal number,
with appropriate units. 1. The batteries in the multiloop circuit below have zero internal resistance.
lJm A 2.00A 20.0 V 7mm Q a) Calculate the current in the 5.00 0 resistor. ‘b) Calculate the power supplied to the Circuit by the 20.0 v battery. //'
Q : £3 i 20 r:
c} Calculate the value of the emf e2. ‘ f. 1 ELC> “r r?rf l: 2. The resistance of a galvanometer coil is 25.0 Q and the current
required for fullnscale deflection is 3.00 mA. a) Show, in a labeled diagram, how to convert this
galvanometer to an ammeter. (fh b) Calculate the value of the resistor needed to convert this
galvanometer to an ammeter which can read_50.0 mA at
full—scale. "E/ 'Y (“l "mgr; ‘.  " '
{(4.251}; 'L—J—
\ r I 3/?“ '
i c ‘ r‘ "N,
r   . ‘ a ? Li 3. A positively charged particle with velocity 9 A V = 6.00 X 103 m/s i enters a velocity selector, a region of uniform electric field and uniform magnetic fieldn The uniform
a A _ :”"\ r i. magnetic field is given by B = 1.50 T j. +igy ' s
a) For the particle to pass through the velocity selector
undeflected, the magnitude of the electric field must be (g) 9.00 x 103 N/c. i if? a: 1'!“ if; B. 4.00 x 103 N/C. {rqu‘ri r“/
c. 1.11 x 10’4 N/C. l 
D. not enough information given, need to know the mass of the particle. {R} B c D (CIRCLE ONE) b) For the particle to pass through the velocity selector
undetected, the direction of the uniform electric field must be
A
A. + i
A
B.  l i,
A f C. + j 5 j
A L,
D. — j
A
0 E. + k
A
F. — k G. none of the choices given. A B c D “#3” E ‘ G (CIRCLE ONE) 2.00 cm W
3AM A 4. A rectangular loop of wire, 2.00 cm by 6.00 cm, lies in the x—y
plane and carries a constant clockwise current of 3.00 A, as
Shown. The loop is in a uniform magnetic field in the positive a A
y direction, given by B : 0.25 T j. i a) Calculate the force on side AB of the loop. I) J EH
 f}
2 a r . “‘3
j J a.
. L
magnitude: '0 jg “J
direction: +X ,—x +y y {12: —z other {CIRCLE ONE) XJ/
b) Calculate the force on side AD of the loop. 2" [M
0 J ' M
magnitude: 1 I)
direction: +X ~X +y —y’ +2 72 other (CIRCLE ONE)
c) Calculate the magnetic moment of the loop.
out)" ‘ ' *. r f“ ’3. 4’:  ‘t.
magnitude: v09 In /%;5AW‘ rrfx
direction: +X f?;\ +y —y +2 (:E9j other (CIRCLE ONE) d) Calculate the torque on the loop.
[V H“ /[A i: L) “E if ,b‘“  I lira 13*.rﬂlgs <:>\M
magnitude: q ¥ J~ ' jﬁeﬁ l L’ direction: —x +y ﬂy +z other (CIRCLE ONE)
\_7_,_/' +X 5. Two long straight wires are perpendicular to the page and
located on the x—axis as Shown. Wire 1 carries current
I1 : 3.00 A out of the page and wire 2 carries 12 = 3.00 A
into the page. a) Calculate the magnitude of the magnetic field at point A,
10.00 cm from the origin, 0. ;__um‘ i L g r
A .. U
W 
[/ \‘ *2»! b) What is the direction of the magnetic field at point A? +X X +y FE? out of page into page (CIRCLE ONE) 5
\‘ k c) Calculate the magnitude of the force per unit length
exerted by wire 1 and wire 2. t? ‘ fl, d) What is the direction of the force by wire 1 on wire 2? 1 2%) —x +y —y out of page into page (CIRCLE ONE)
\ 6. A slidewire generator consists of a conducting rod, length
12.00 cm and resistance 5.00 ohm, that makes contact at points
A and B with a U—shaped conductor of negligible resistance.
This device sits in a uniform constant magnetic field of
0.80 T, directed into the page, as shown. The conducting rod
is pulled to the right at constant speed, 0.25 m/s. x 5 x x F x 12.00 cm “‘ K
B
a) The magnetic flux in the conducting loop is //////»
A. zero.
B. constant.
C. increasing.
D. decreasing. U,
A B D (CIRCLE ONE) ._
ff
1”"
b) Calculate the value of the current induced in the f
Conducting loop. _r n’J—)
“ ._ "' ;:(y% 13' ”
f— . t _ ” '1’
p . r
r, v r k r
‘ —4” JV“ ;
s i c} The current induced in the conducting loop is clockwise and constant. clockwise and increasing. K r. 1
clockwise and decreasing.,*' // j
counter clockwise and censtant. ml
counter clockwise and/increasing.
counter clockwise/and decreasing. \ ~ / *ljfUUOUJP F (CIRCLE ONE) V
03
('1 d) Calculate the magnitude of the force required to pull the
conducting rod at the constant speed of 0.25 m/s. 1 \ f a /i! j
l ‘. 7. BONUS QUESTION (5 Points) The figure shows three long straight wires, each with current I, two parallel (up) and one antiparallel (down). Four
Amperian paths are labeled A, B, C and D. Rank these paths
—>>
according to the value of @Bdl for each. Rank greatest to least. *** IMPORTANT STUFF *** —> a a #1
F = qv x B B = O
4hr
—>—)
$8 : B. B : nonl
a —9 —3 F:les 32%
2a
a a —9 ——)
,1 = IA SEEd1 : #01 m
3 —) w) or,"
T=#XB {1:7 YB
dt
21 = O
‘ e = VBL
Z‘VZO
, B
Re—R1+R2+R3+ gﬁEdl:—~—e
* dt
1 l l 1
: —__ + 5—" ‘ “” + P = El
Re R1 R2 R3
P=I2R
h Tm
uh = 4n x 10" l__ ...
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 Spring '06
 SMITH
 Physics, Magnetic Field, $8, 4Hr, undeflected

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