Answer
$R = 40~\Omega$
Work Step by Step
On the graph, when $\omega_d = 0$, the impedance $Z = 40~\Omega$
When $\omega_d = 0$, the impedance $Z = R$
Therefore, $R = 40~\Omega$
Fundamentals of Physics Extended (10th Edition)
by Halliday, David; Resnick, Robert; Walker, Jearl
Published by
Wiley
ISBN 10:
1-11823-072-8
ISBN 13:
978-1-11823-072-5
Chapter 31 - Electromagnetic Oscillations and Alternating Current - Problems - Page 938: 42a
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