By what percentage the impedance in an AC series circuit should be ...

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By what percentage the impedance in an AC series circuit should be increased so that the power factor changes from (1/2) to (1/4) (when \( R \) is constant) ?
(A) \( 200 \% \)
(B) \( 100 \% \)
(C) \( 50 \% \)
(D) \( 400 \% \)
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