22
CHAPTER 15
15.39
The area of the rectangular plane is
( )( )
2
0.350 m
0.700 m
0.245 m
A
==
.
(a) When the plane is parallel to the
yz
plane,
0
θ
=
°
, and the flux is
()
( )
32
m
cos
2
cos
3.50
10 N C
0.245
0
858 N m
C
E
EA
Φ=
=
×
°=
⋅
(b) When the plane is parallel to the
x
axis,
90
=
°
and
0
E
(c)
( )
cos
3.50
0.245 m
cos40.0
657 N m
C
E
EA
=
×
⋅
2
15.40
In this problem, we consider part (b) first.
(b) Since the field is radial everywhere, the charge distribution generating it must be
spherically symmetric . Also, since the field is radially inward, the net charge
inside the sphere is
negative charge .
(a) Outside a spherically symmetric charge distribution, the field is
2
e
kQ
E
r
=
. Thus, just
outside the surface where
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 Fall '10
 STAFF
 Physics, Electric Fields, Force, Electric charge, EA cosθ

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