18. Eq. 236 (Gauss’ law) gives
ε
ο
Φ =
q
enc
.
(a) The value
Φ =
– 9.0
×
10
5
(in SI units)
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
5
(in SI units), which implies
6
enc
3.54 10 C.
q
−
=×
But we have already accounted for some of that charge in part (a), so
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This note was uploaded on 01/25/2011 for the course PHYSICS 17029 taught by Professor Rebello,nobels during the Spring '10 term at Kansas State University.
 Spring '10
 Rebello,NobelS

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