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

  • question_answer
    When the speed of a dc motor increases the armature current [CPMT 1984, 85; MP PMT 2004]

    A)            Increases

    B)            Decreases

    C)            Does not change

    D)            Increases and decreases continuously

    Correct Answer: B

    Solution :

                       With the increasing speed, w increases. Thus current reduces due to increase in the back e.m.f. Moreover \[i=\frac{V-K\omega }{R}\]. More w will lead to the lesser current.


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