Answer
$30ohms$
Work Step by Step
$R_{eq}=55=\frac{R}{2}+40$
Thus, $R=15\times2=30ohms$
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 18 - Basic Electric Circuits - Learning Path Questions and Exercises - Exercises - Page 653: 3
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