ch21-p041 - 41 The charge dq within a thin section of the...

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41. The charge dq within a thin section of the rod (of thickness dx ) is ρ A dx where 42 4.00 10 m A and is the charge per unit volume. The number of (excess) electrons in the rod (of length L = 2.00 m) is n = q /(– e ) where e is given in Eq. 21-12. (a) In the case where
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