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NEET Sample Paper NEET Sample Test Paper-5

  • question_answer
    The alternating emf applied and the current flowing in an AC circuits are represented by \[\varepsilon ={{\varepsilon }_{0}}\,\sin \omega t\] and \[I={{I}_{0}}\,\sin \,\left( \omega t+\frac{\pi }{2} \right)\]respectively. The power loss in the circuit will be:

    A)  \[\frac{{{\varepsilon }_{0}}{{I}_{0}}}{4}\]                             

    B)  \[\frac{{{\varepsilon }_{0}}{{I}_{0}}}{\sqrt{2}}\]

    C)  \[\frac{{{\varepsilon }_{0}}{{I}_{0}}}{2}\]                      

    D)  zero

    Correct Answer: D

    Solution :

    Here, from the sinusoidal wave, we conclude that \[\phi =\frac{r}{2}\]             \[\Rightarrow \]   Power loss \[P={{V}_{rms/rms}}\cos \phi =0\]


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