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Coker sucks
1
gonzalez (cmg3958) HW01 lai (55540)
9. ball Z is positive and ball X is neutral.
10. balls Z and X are both negative, but ball
X carries more charge than ball Z.
Explanation:
When the conducting wire is run between
Z and X, some positive charge flows from
gonzalez (cmg3958) HW02 lai (55540)
q
infinity is equal to the potential VA = ke at
r
the surface of the sphere, where r is the radius
of the spherical conductor, so
q
q
VA VB = ke
r b
= (8.98755 109 N m2 /C2 )
3.4 1011 C 3.4 1011 C
0.038 m
0.05 m
= 1.929
gonzalez (cmg3958) HW02 lai (55540)
The potential difference from O to A is
defined as
Z A
~ d~s .
V = VA VO =
E
O
~ = (312 V/m) . We need
We know that E
to choose a path to integrate along. Because
the electric force is conservative, it doesnt
matter wh
gonzalez (cmg3958) HW02 lai (55540)
A dipole field pattern is shown in the figure.
Consider various relationships between the
electric potential at different points given in
the figure.
J
L
N
+
X
H
Consider five potential relationships
a) VJ = VH > VN
b)
gonzalez (cmg3958) HW02 lai (55540)
6
What is the potential difference across the
plates of the capacitor? The permittivity of a
vacuum is 8.8542 1012 C2 /N m2 .
Find the equivalent capacitance between
points a and c for the group of capacitors
connected
gonzalez (cmg3958) HW02 lai (55540)
1. UA > UO
2. UA = UO
3. UO > UA correct
4. undetermined
Explanation:
U0 > UA because Uelec is negative.
008 10.0 points
A particle of mass 6 105 kg and charge
5 C moves downward from point A to point
B a distance of 3
gonzalez (cmg3958) HW01 lai (55540)
018 10.0 points
A cubic box of side a, oriented as shown, contains an unknown charge. The vertically directed electric field has a uniform magnitude
E at the top surface and 2 E at the bottom
surface.
negative) and the
gonzalez (cmg3958) HW01 lai (55540)
This print-out should have 20 questions.
Multiple-choice questions may continue on
the next column or page find all choices
before answering.
001 10.0 points
When combing your hair, you scuff electrons
from your hair on
gonzalez (cmg3958) HW01 lai (55540)
Explanation:
The electric field due to a point charge a
distance x away has a magnitude
E=
011 (part 2 of 2) 10.0 points
What is the magnitude of the electric field if
one charge is positive and the other negative,
both
gonzalez (cmg3958) HW03 lai (55540)
Let :
A = 2.6 106 m2 ,
I = 1.4 A = 1.4 C/s ,
= 2.7 g/cm3 = 2.7 106 g/m3 ,
ne = 2 ,
nA = 6.022 1023 /mol and
q = 1.602 1019 C .
n = ne
speed is
NA
= ne
, so the drift
M/NA
M
IM
I
=
nqA
ne NA q A
(1.4 C/s)(26.98 g/mol)
gonzalez (cmg3958) HW03 lai (55540)
1
3.74 kg
This print-out should have 20 questions.
(1.602 1019 C)
Multiple-choice questions may continue on
3.27 1025 kg
=
the next column or page find all choices
(16.5 h)(3600 s/h)
before answering.
= 30.8461 A .
001
moreno (ym4528) HW2 bohm (55970)
1
This print-out should have 20 questions.
Multiple-choice questions may continue on
the next column or page nd all choices
before answering.
001 8.0 points
Consider a conducting spherical shell with
inner radius 0.9 m and
moreno (ym4528) HW1 bohm (55970)
This print-out should have 18 questions.
Multiple-choice questions may continue on
the next column or page nd all choices
before answering.
001 8.0 points
Three small spheres carry equal amounts of
electric charge. They ar
moreno (ym4528) HW4 bohm (55970)
This print-out should have 20 questions.
Multiple-choice questions may continue on
the next column or page nd all choices
before answering.
001 (part 1 of 2) 10.0 points
A generator has a terminal voltage of 114 V
when it
moreno (ym4528) HW3 bohm (55970)
This print-out should have 24 questions.
Multiple-choice questions may continue on
the next column or page nd all choices
before answering.
001 6.0 points
A parallel-plate capacitor has a capacitance
C0 . A second parallel
gonzalez (cmg3958) HW03 lai (55540)
P =IV
P
5000 W
I=
=
= 862.069 A .
V
5.8 V
V2
V2
Since P =
,R=
and the smaller filR
P
ament resistance occurs with the larger power,
which is
R=
018 (part 2 of 2) 10.0 points
If this same electric motor instead draws
12.
gonzalez (cmg3958) HW03 lai (55540)
4.6 1021 (1.602 1019 C) 1 min
=
Correct answer: 7.1175 .
7 min
60 s
= 1.75457 A
Explanation:
Let :
and from Ohms Law,
V = I R = (1.75457 A)(20 ) = 35.0914 V .
5
R0 = 6.5 ,
T0 = 20 C ,
T1 = 45 C , and
= 0.0038 ( C)1 .
0
gonzalez (cmg3958) HW03 lai (55540)
across a 2 m length of tungsten wire that has
a cross-sectional area of 0.46 mm2 .
What is the current in the wire? The resistivity of the tungsten is 5.6 108 m .
Correct answer: 4.18929 A.
Explanation:
4
a common sight
gonzalez (cmg3958) HW01 lai (55540)
013 10.0 points
Consider three electric field patterns due to
static electric charges outside the regions
shown.
(a)
6
on the left and right, respectively, so (b) is
possible.
(c) Electrostatic lines of force begin and
gonzalez (cmg3958) HW01 lai (55540)
7
Correct answer: 4.43818 106 m/s.
Explanation:
L
E
m
Let :
m = 1.5 g = 0.0015 kg ,
L = 10.8 cm = 0.108 m ,
E = 16000 N/C ,
= 46 , and
g = 9.81 m/s2 .
The ball is in equilibrium horizontally
Fe FT,x = 0
qE Ft sin = 0
F
pokharel (yp624) HW10 TSOI (92515)
This print-out should have 16 questions.
Multiple-choice questions may continue on
the next column or page nd all choices
before answering.
001 (part 1 of 2) 10.0 points
An object is 13 cm from the surface of a
reective
bhakta (nnb232) HW #7 Antoniewicz (56490) This print-out should have 26 questions. Multiple-choice questions may continue on the next column or page nd all choices before answering. 001 (part 1 of 2) 5.0 points The primary of a step-down transformer has 3
bhakta (nnb232) HW #6 Antoniewicz (56490) This print-out should have 25 questions. Multiple-choice questions may continue on the next column or page nd all choices before answering. 001 (part 1 of 2) 5.0 points A horizontal circular wire loop of radius 0.
bhakta (nnb232) HW #5 Antoniewicz (56490) This print-out should have 23 questions. Multiple-choice questions may continue on the next column or page nd all choices before answering. 001 10.0 points A wire carrying a current 20 A has a length 0.1 m between