P22_006.PDF

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Chapter 22 - 22.6
6. (a) The individual force magnitudes (acting on Q ) are, by Eq. 22-1,
k |
−
q 1 |
2 2 = k |
a
q 2 |
2 2
a
−
a
−
a
.Since Q is located between q 1 and q 2 , we conclude q 1 and q 2 are
like-sign. Consequently, q 1 =9 q 2 .
(b) Nowwe have
|
q 1 |
=9
q 2 |
k
−
|
q 1 |
Q
2 2 = k
a
|
q 2 |
2 2
a
−
3 a
−
3 a
. Now, Q is not located between q 1 and q 2 , one of them must push and
the other must pull. Thus, they are unlike-sign, so q 1 =
|
q 1 |
=25
|
q 2 |
−
25 q 2 .
Q
Q
which leads to
|
Q
which yields
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