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

  • question_answer
    A step-up transformer operates on a 230 V line and supplies a load of 2 ampere. The ratio of the primary and secondary windings is 1 : 25. The current in the primary is [CBSE PMT 1998]

    A)            15 A                                         

    B)            50 A

    C)            25 A                                         

    D)            12.5 A

    Correct Answer: B

    Solution :

               \[\frac{{{N}_{s}}}{{{N}_{p}}}=\frac{{{i}_{p}}}{{{i}_{s}}}\] or \[\frac{25}{1}=\frac{{{i}_{p}}}{2}\Rightarrow {{i}_{p}}=50A\]


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