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NEET Sample Paper NEET Sample Test Paper-87

  • question_answer
    In an a.c. circuit V and I are given by \[V=100\,\sin \,(100t)\,volts\] \[I=100\,\sin \,(100t+\pi /3)\,mA\] The power dissipated in the circuit is

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

    B) \[10\] watt

    C) \[2.5\]watt         

    D) \[5.0\]watt

    Correct Answer: C

    Solution :

    [c] \[P={{V}_{r.m.s}}\times {{I}_{r.m.s}}\times \cos \phi =\frac{1}{2}{{V}_{0}}\,{{I}_{0}}\,\cos \phi \] \[=\frac{1}{2}\times 100\times (100\times {{10}^{-3}})\cos \pi /3\] \[=2.5W\]         


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