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

  • question_answer
    A conductor of length 2 m carrying current 2A is held parallel to an infinitely Long conductor carrying current of 12 A at a distance of 100 mm, the force on small conductor is:

    A) \[8.6\times {{10}^{-5}}N\]                   

    B) \[6.6\times {{10}^{-5}}N\]

    C) \[7.6\times {{10}^{-5}}N\]                   

    D) \[9.6\times {{10}^{-5}}N\]

    Correct Answer: D

    Solution :

    (d) \[9.6\times {{10}^{-5}}N\] Here, \[{{l}_{1}}=2\,\,A,{{l}_{2}}=12\,\,A,\,d=100\,mm=0.1\,m,l=2m\] Now total force on length i of small conductor \[F=\frac{{{\mu }_{0}}}{4\pi }\times \frac{2{{l}_{1}}{{l}_{2}}}{d}l=\frac{{{10}^{-7}}\times 2\times 2\times 12\times 2}{0.1}\] \[=9.6\times {{10}^{-5}}N\]


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