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12th Class Physics Alternating Current / प्रत्यावर्ती धारा Question Bank Case Based (MCQs) - Alternating Currents

  • question_answer
    The number of turns in primary coil of a transformer is 20 and the number of turns in a secondary is 10. If the voltage across the primary is 220 AC V, what is the voltage across the secondary?

    A) 100 AC V                     

    B) 120 AC V

    C) 110 AC V                     

    D) 220 AC V

    Correct Answer: C

    Solution :

    (c) 110 AC V For a transformer, \[\frac{{{V}_{S}}}{{{V}_{P}}}=\frac{{{N}_{S}}}{{{N}_{P}}}\] Where, N denotes number of turns and V = voltage. \[\therefore \frac{{{V}_{S}}}{220}=\frac{10}{20}\therefore {{V}_{S}}=110\,AC\,V\]


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