12. Eq. 236 (Gauss’ law) gives
ε
ο
Φ =
q
enc
.
(a) Thus, the value
52
2.0 10 N m /C
Φ=
×
⋅
for small
r
leads to
12
2
2
5
2
6
6
central
0
(8.85 10
C /N m )(2.0 10 N m /C)
1.77 10 C
1.8 10 C
q
ε
−−
−
=Φ
=
×
⋅
×
⋅
=
×
≈ ×
.
(b) The next 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
This is the end of the preview. Sign up
to
access the rest of the document.
This note was uploaded on 09/07/2010 for the course PHYS 244 taught by Professor Ac during the Fall '10 term at The Petroleum Institute.
 Fall '10
 AC

Click to edit the document details