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

  • question_answer
    A long solenoid has a radius a and number of turns per unit length is n. If it carries a current i, then the magnetic field on its axis is directly proportional to                                                         [MP PMT 1994]

    A)            ani

    B)            ni

    C)            \[\frac{ni}{a}\]                    

    D)            \[{{n}^{2}}i\]

    Correct Answer: B

    Solution :

               Because \[B={{\mu }_{0}}ni\] Þ \[B\propto ni\].


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