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NEET Sample Paper NEET Sample Test Paper-43

  • question_answer
    The e. m. f E = 4 cos 1000t volts is applied to an \[L-R\] circuit containing inductance 3 mH and resistance\[4\Omega \]. The amplitude of current is -

    A) \[4\sqrt{7}\,\,A\]            

    B) 1.0 A

    C) \[\frac{4}{7}\] A                       

    D) 0.8 A

    Correct Answer: D

    Solution :

    \[{{i}_{0}}=\frac{{{V}_{0}}}{Z}\,,\] \[Z=\sqrt{{{R}^{2}}+{{(\omega L)}^{2}}}\] \[=\sqrt{{{4}^{2}}+{{(1000\times 3\times {{10}^{-3}})}^{2}}}=5\Omega \] \[{{i}_{0}}=\frac{4}{5}\] \[{{i}_{0}}=0.8A\]


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