JEE Main & Advanced Physics Alternating Current / प्रत्यावर्ती धारा Question Bank ac Circuits

  • question_answer
    The power factor of a good choke coil is         [MP PMT 1994]

    A)            Nearly zero                           

    B)            Exactly zero

    C)            Nearly one                            

    D)            Exactly one

    Correct Answer: A

    Solution :

               \[\cos \varphi =\frac{R}{Z}\]. In choke coil \[\varphi \approx 90{}^\circ \]so \[\cos \varphi \approx 0\]


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