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

  • question_answer
    In a step up transformer, if ratio of turns of primary to secondary is 1 : 10 and primary voltage is 230 V. If the load current is 2A, then the current in primary is [Orissa PMT 2005]

    A)            20 A                                         

    B)            10 A

    C)            2 A

    D)            1 A

    Correct Answer: A

    Solution :

               \[\frac{{{N}_{P}}}{{{N}_{S}}}=\frac{{{I}_{S}}}{{{I}_{P}}}\] Þ \[{{I}_{P}}=\frac{{{N}_{S}}}{{{N}_{P}}}{{I}_{S}}=\frac{10}{1}\times 2=20\,A\].


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