Answer
$31\times10^{13}$
Work Step by Step
Number of electrons = $\frac{total\,\,charge}{each\,\, electron\,\, charge}$
= $\frac{50\times10^{-6}}{1.6\times10^{-19}}=31\times10^{13}$
College Physics (7th Edition)
by Wilson, Jerry D.; Buffa, Anthony J.; Lou, Bo
Published by
Pearson
ISBN 10:
0-32160-183-1
ISBN 13:
978-0-32160-183-4
Chapter 15 - Electric Charge, Forces, and Fields - Learning Path Questions and Exercises - Exercises - Page 556: 2
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