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For an \( L C R \) circuit, the power transferred from the driving source to the driven oscillator is \( P=I^{2} Z \cos \phi \).
\( \mathrm{P} \)
(a) Here, the power factor \( \cos \phi \geq 0, P \geq 0 \).
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(b) The driving force can give no energy to the oscillator \( (P=0) \) in some cases.
(c) The driving force cannot syphon out \( (\mathrm{P}0) \) the energy out of oscillator.
(d) The driving force can take away energy out of the oscillator.
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