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18. Eq. 236 (Gauss’ law) gives
ε
ο
Φ =
q
enc
.
(a) The value
52
9.0 10 N m /C
Φ=−
×
⋅
for small
r
leads to
q
central
= – 7.97
×
10
−
6
C
or
roughly – 8.0
µ
C.
(b) The next (nonzero) value that
Φ
takes is
4.0 10 N m /C
Φ=+
×
⋅
, which implies
6
enc
3.54 10 C.
q
−
=×
But we have already accounted for some of that charge in part (a), so
the result is
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This note was uploaded on 09/07/2010 for the course PHYS 235 taught by Professor Ed during the Fall '10 term at The Petroleum Institute.
 Fall '10
 ED

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