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JEE Mains · Physics · STD 12 -7. Alternating current

 \(LCR\)  પરિપથમાં ઇન્ડકટિવ રીએકટન્સ  \(\left( X _{ L }\right)\) કેપેસેટિવ રીએકટન્સ  \(\left( X _{ C }\right)\) અને અવરોધ \(( R )\) અનુક્રમે \(10\, \Omega\) ,\(4\, \Omega\) અને  \(6\, \Omega\) હોય તો પાવર ફેક્ટર શું હશે 

  1. A \(\frac{1}{2}\)
  2. B \(\frac{1}{2 \sqrt{2}}\)
  3. C \(\frac{1}{\sqrt{2}}\)
  4. D \(\frac{\sqrt{3}}{2}\)
Verified Solution

Answer & Solution

Correct Answer

(C) \(\frac{1}{\sqrt{2}}\)

Step-by-step Solution

Detailed explanation

We know that power factor is \(\cos \phi\) \(\cos \phi=\frac{ R }{ Z }\) \(Z=\sqrt{R^{2}+\left(X_{L}-X_{C}\right)^{2}} \quad \ldots\) \(\Rightarrow Z =\sqrt{6^{2}+(10-4)^{2}}\) \(\Rightarrow Z =6 \sqrt{2} \mid \cos \phi=\frac{6}{6 \sqrt{2}}\) \(\cos \phi=\frac{1}{\sqrt{2}}\)
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