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

  • question_answer
    In a step-up transformer the turn ratio is 1:10. A resistance of 200 ohm connected across the secondary is drawing a current of 0.5 A. What is the primary voltage and current [MP PET 2000]

    A)            50 V, 1 amp                          

    B)            10 V, 5 amp

    C)            25 V, 4 amp                          

    D)            20 V, 2 amp

    Correct Answer: B

    Solution :

               \[{{N}_{p}}:{{N}_{s}}=1:10\] and \[{{V}_{s}}=0.5\times 200=100\ V\] \[\frac{{{V}_{s}}}{{{V}_{p}}}=\frac{{{N}_{s}}}{{{N}_{p}}}\Rightarrow \frac{100}{{{V}_{p}}}=\frac{10}{1}\Rightarrow {{V}_{p}}=10\ V\]            \[\frac{{{i}_{p}}}{{{i}_{s}}}=\frac{{{N}_{s}}}{{{N}_{p}}}\Rightarrow \frac{{{i}_{p}}}{0.5}=\frac{10}{1},\ {{i}_{p}}=5\ amp\]


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