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

  • 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 seconary ?

    A) 100 acV

    B) 120 ac V

    C) 110 acV

    D) 220 ac V

    Correct Answer: C

    Solution :

    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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