P27_002.PDF

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Chapter 27 - 27.2
2. We adapt the discussion in the text to a moving two-dimensional collection of charges. Using σ for the
charge per unit area and w for the belt width, we can see that the transport of charge is expressed in
the relationship i = σvw ,whichleadsto
σ =
i
vw =
10 − 6 A
(30 m / s)(50
×
10 − 2 m) =6 . 7
×
10 − 6 C / m 2
.
×
100
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