JEE Main & Advanced Physics Magnetic Effects of Current / करंट का चुंबकीय प्रभाव Question Bank Biot-savart's Law and Amperes Law

  • question_answer
    If a long hollow copper pipe carries a direct current, the magnetic field associated with the current will be [CBSE PMT 1999; AFMC 1999; CPMT 1984, 2000; Pb. PET 2000; JIPMER 2002]

    A)            Only inside the pipe

    B)            Only outside the pipe

    C)            Neither inside nor outside the pipe

    D)            Both inside and outside the pipe

    Correct Answer: B

    Solution :

                       Because for inside the pipe \[i=0\]            \[\therefore B=\frac{{{\mu }_{0}}i}{2\pi r}=0\]


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