College Physics (7th Edition)

Published by Pearson
ISBN 10: 0-32160-183-1
ISBN 13: 978-0-32160-183-4

Chapter 18 - Basic Electric Circuits - Learning Path Questions and Exercises - Exercises - Page 653: 3

Answer

$30ohms$

Work Step by Step

$R_{eq}=55=\frac{R}{2}+40$ Thus, $R=15\times2=30ohms$
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