Answer
$21cm$
Work Step by Step
We know that
$L=\frac{N_e(e)}{q/l}$
We plug in the known values to obtain:
$L=\frac{(1.8\times 10^{13})(1.6\times 10^{-9})}{0.14\times 10^{-6}}=21cm$
Physics Technology Update (4th Edition)
by Walker, James S.
Published by
Pearson
ISBN 10:
0-32190-308-0
ISBN 13:
978-0-32190-308-2
Chapter 19 - Electric Charges, Forces, and Fields - Problems and Conceptual Exercises - Page 683: 10
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