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

  • question_answer
    Armature current in dc motor will be maximum when [CPMT 1986, 88; MP PET 1995]

    A)            Motor has acquired maximum speed

    B)            Motor has acquired intermediate speed

    C)            Motor has just started moving

    D)            Motor is switched off

    Correct Answer: C

    Solution :

                       Motor e.m.f. equation \[{{E}_{b}}=V-{{I}_{a}}{{R}_{a}}\]            At starting \[{{E}_{b}}=0,\] so \[{{I}_{a}}\]will be maximum.


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