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

  • question_answer
    An e.m.f.\[E=4\cos (1000t)\] volt  is applied to an LR-circuit of inductance 3 mH and resistance 4 ohms. The amplitude of current in the circuit is                                       [MP PMT 1997]

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

    B)            1.0 A

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

    D)            0.8 A

    Correct Answer: D

    Solution :

               \[i=\frac{V}{Z}=\frac{4}{\sqrt{{{4}^{2}}+{{(1000\times 3\times {{10}^{-3}})}^{2}}}}=0.8\,\,A\]


You need to login to perform this action.
You will be redirected in 3 sec spinner