P22_046.PDF
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Chapter 22 - 22.46
46. The charge
dq
within a thin shell of thickness
dr
is
ρAdr
where
A
=4
πr
2
.Thus,with
ρ
=
b/r
,wehave
q
=
rdr
=2
πb
r
2
−
r
1
.
With
b
=3
.
0
µ
C
/
m
2
,
r
2
=0
.
06 m and
r
1
=0
.
04 m, we obtain
q
=0
.
038
µ
C.
dq
=4
πb
r
2
r
1
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