RAJASTHAN ­ PET Rajasthan PET Solved Paper-2005

  • question_answer
    In question 98, how much inductance is added the circuit so that reactance becomes minimum?

    A)  0.31 H           

    B)  0.41 H

    C)  1.25 H           

    D)  1.75 H

    Correct Answer: A

    Solution :

     \[{{X}_{L}}={{X}_{C}}\] \[\omega L=\frac{1}{\omega C}\] \[L=\frac{1}{{{\omega }^{2}}C}=\frac{1}{{{(314)}^{2}}\times 25\times {{10}^{-6}}}\] \[=0.41\text{ }H=0.41-0.1\] \[=0.31H\]


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