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12th Class Physics Alternating Current / प्रत्यावर्ती धारा Question Bank MCQ - Alternating Currents

  • question_answer
    The ratio of number of turns of primary coil to secondary coil in a transformer is 2 : 3. If a cell of 6 V is connected across the primary coil. then voltage across the secondary coil will be:

    A) 3 V                              

    B) 6 V     

    C) 9 V                              

    D) 12 V

    Correct Answer: C

    Solution :

    (c) 9 V                         \[\frac{{{V}_{S}}}{{{V}_{P}}}=\frac{{{N}_{S}}}{{{N}_{P}}}\]                         \[\frac{{{V}_{S}}}{6}=\frac{3}{2}\Rightarrow {{V}_{S}}=\frac{6\times 3}{2}=9V\]


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