J & K CET Engineering J and K - CET Engineering Solved Paper-2006

  • question_answer
    An inductor is connected to an AC source, When compared to voltage, the current in the lead wires

    A)  is ahead in phase by n

    B)  lags in phase by n

    C)  is ahead in phase by ?

    D)  lags in phase by ?

    Correct Answer: D

    Solution :

    In a purely inductive circuit, current is     \[i={{i}_{0}}\,\,\sin \,\left( \omega t-\frac{\pi }{2} \right)\]      Which shows that the current lags behind the emf by a phase angle of \[\frac{\pi }{2}\] or \[{{90}^{o}}\] or the emf leads the current by a phase angle of \[\frac{\pi }{2}\] or \[{{90}^{o}}\]


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