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28
CHAPTER 15
15.54
The charges on the spheres will be equal in magnitude and opposite in sign. From
22
e
Fk
qr
=
, this charge must be
()
2
4
2
3
92
2
1.00
10 N
1.00 m
1.05
10
C
8.99
10 N m
C
e
Fr
q
k
−
×
⋅
==
=
×
×⋅
The number of electrons transferred is
3
15
19
1.05
10
C
6.59
10
1.60
10
C
q
n
e
−
−
×
=
×
×
The total number of electrons in 100-g of silver is
25
0 g
2.62
10
=
23
electrons
atoms
1 mole
47
6.02
10
10
atom
mole
107.87 g
N
=×
×
Thus, the fraction transferred is
15
10
25
6.59
10
2.51 10
2.62
10
n
N
−
×
×
×
(that is, 2.51 out of every 10 billion).
15.55
4
52
cos
2.00
10 N C
6.00 m
3.00 m
cos10.0
3.55
C
E
EA
θ
Φ=
°
=× ⋅

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