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RAJASTHAN ­ PET Rajasthan PET Solved Paper-2004

  • question_answer
    The reactance of inductance at\[{{10}^{4}}\]Hz is\[{{10}^{4}}\]\[\Omega \]. Its reactance at \[2\times {{10}^{4}}Hz\] will be

    A)  \[{{10}^{4}}\Omega \]           

    B)  \[2\times {{10}^{4}}\Omega \]

    C)  \[3\times {{10}^{4}}\Omega \]       

    D)  \[4\times {{10}^{4}}\Omega \]

    Correct Answer: B

    Solution :

     \[{{X}_{L}}=\omega L=2\pi fL\] \[{{X}_{L}}\propto f\] If frequency is double then reactance will be double.


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