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JEE Main & Advanced Physics Electro Magnetic Induction Question Bank Application of EMI (Motor, Dynamo, Transformer)

  • question_answer
    The armature of dc motor has \[20\,\Omega \] resistance. It draws current of 1.5 ampere when run by 220 volts dc supply. The value of back e.m.f. induced in it will be [MP PMT 1999]

    A)            150 V                                       

    B)            170 V

    C)            180 V                                       

    D)            190 V

    Correct Answer: D

    Solution :

               \[i=\frac{E-e}{R}\Rightarrow 1.5=\frac{220-e}{20}\Rightarrow e=190\ V\]


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