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

  • question_answer
    The magnitude of the magnetic field at the centre of the tightly wound 150 turn coil of radius 12 cm carrying a current of 2 A is:

    A) 18 G                            

    B) 19.7 G

    C) 15.7 G                         

    D) 17.7G

    Correct Answer: C

    Solution :

    (c) 15.7 G Here,    \[N=150,\,R=12\,cm=12\times {{10}^{-3}}m,\,l=2A\] \[\therefore B=\frac{{{\mu }_{0}}Nl}{2R}=\frac{4\pi \times {{10}^{-7}}\times 150\times 2}{2\times 12\times {{10}^{-2}}}\]             \[=1.57\times {{10}^{-3}}T\] \[=1.57\times {{10}^{-3}}T=15.7\times {{10}^{-4}}T=15.7\,G\]


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