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JEE Main & Advanced Physics Alternating Current / प्रत्यावर्ती धारा Question Bank ac Circuits

  • question_answer
    When 100 volt dc is applied across a coil, a current of 1 amp flows through it. When 100 volt ac at 50 cycle\[{{s}^{-1}}\] is applied to the same coil, only 0.5 ampere current flows. The impedance of the coil is                                  [Bihar MEE 1995]

    A)            \[100\,\Omega \]               

    B)            \[200\,\Omega \]

    C)            \[300\,\Omega \]               

    D)            \[400\,\Omega \]

    Correct Answer: B

    Solution :

                       When dc is supplied \[R=\frac{V}{i}=\frac{100}{1}=100\,\Omega \,\]            When ac is supplied \[Z=\frac{V}{i}=\frac{100}{0.5}=200\,\Omega \,\]


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