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JEE Main & Advanced Sample Paper JEE Main Sample Paper-29

  • question_answer
    The magnetic field inside a current carrying toroidal solenoid is B. if its radius is doubled and the current through it is also doubled keeping the total number of turns same, the magnetic field inside the solenoid will be:

    A) \[B/2\]                                 

    B) B

    C) \[2B\]                                   

    D) \[4B\]

    Correct Answer: B

    Solution :

    In a toroidal solenoid, \[\Rightarrow \,f(2)\,\le 7\] For same N,        \[2B=A+C\] As both i and r are doubled, B remains the same.


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