lim (kl9356) – Practice HW 2 – Weathers – (22202)
1
This
printout
should
have
17
questions.
Multiplechoice questions may continue on
the next column or page – find all choices
before answering.
001
10.0 points
Suppose that 3 g of hydrogen, H
2
, is separated
into electrons and protons, and that the pro
tons are placed at the Earth’s North Pole and
the electrons are placed at the South Pole.
The radius of the Earth is 6
.
37
×
10
6
m.
Avogadro’s
number
is
6
.
02214
×
10
23
and
the
molar
mass
of
the
Hatom
is
1
.
00782 g
/
mole.
What is the resulting compressional force
on the Earth? Answer in units of N.
002
10.0 points
Two charges are located in the (
x, y
) plane
as shown in the figure below. The fields pro
duced by these charges are observed at a point
p
with coordinates (0
,
0).
The
Coulomb
constant
is
8
.
98755
×
10
9
N
·
m
2
/
C
2
.
−
7
.
7 C
−
8 C
p
1
.
6 m
1
.
5 m
3 m
2
.
8 m
Use Coulomb’s law to find the
x
component
of the electric field at
p
.
Answer in units of N
/
C.
003
(part 1 of 2) 10.0 points
Consider three charges arranged as shown.
−
+
+
3
.
44 cm
2
.
9 cm
4
.
48
μ
C
5
.
17
μ
C
−
3
.
79
μ
C
The
acceleration
due
to
gravity
is
9
.
8 m
/
s
2
. The Coulomb constant is 8
.
98755
×
10
9
N m
2
/
C
2
.
What is the electric field at a point 1
.
92 cm
to the left of the middle charge?
Answer in
units of N
/
C.
004
(part 2 of 2) 10.0 points
What is the magnitude of the force on a
−
3
.
79
μ
C charge placed at this point? Answer
in units of N.
005
(part 1 of 2) 10.0 points
Three point charges are placed at the vertices
of an equilateral triangle.
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 Spring '00
 Littler
 Magnetism, lim, Electric charge

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