JEE Main & Advanced Physics Alternating Current / प्रत्यावर्ती धारा Question Bank Alternating Current, Voltage and Power

  • question_answer
    The resistance of a coil for dc is in ohms. In ac, the resistance                                      [CPMT 1987]

    A)            Will remain same               

    B)            Will increase

    C)            Will decrease                       

    D)             Will be zero

    Correct Answer: B

    Solution :

               The coil having inductance L besides the resistance R. Hence for ac it?s effective resistance \[\sqrt{{{R}^{2}}+X_{L}^{2}}\] will be larger than it?s resistance R for dc.


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