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12th Class Physics Magnetism Question Bank MCQ - Moving Charges and Magnetism

  • question_answer
                                        A wire in the form of a circular loop, of one turn carrying a current, produces magnetic induction B at the centre. If the same wire is Looped into a coil of two turns and carries the same current, the new value of magnetic induction at the centre is:

    A) B                     

    B) 2B     

    C) 4B                               

    D) 8B           

    Correct Answer: C

    Solution :

    (c) 4B.                         \[B=\frac{{{\mu }_{0}}l}{2r},\,B'=\frac{{{\mu }_{0}}(2)l}{2(r/2)}=4B\]


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