The given equivalent circuit is critically damped. Find the value of \( R_{1} \) in the given ci...

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The given equivalent circuit is critically damped. Find the value of \( R_{1} \) in the given circuit
(a) \( 20 \Omega \)
(b) \( 10 \Omega \)
(c) \( 12 \Omega \)
(d) \( 50 \Omega \)
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