railway DFCCIL Executive 2025 Mock Test Network Theory Sinusoidal Steady State Analysis

एक RL परिपथ में शक्ति गुणांक \(\dfrac{1}{\sqrt 2}\) है। यदि आवृत्ति दोगुना हो जाती है, तो नया शक्ति गुणांक कितना है?

1
\(\dfrac{1}{\sqrt 5}\)
2
\(\dfrac{1}{\sqrt 2}\)
3
\(\dfrac{1}{2}\)
4
\(\dfrac{1}{\sqrt 8}\)
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