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

  • question_answer
    Two parallel wires 2m apart carry currents of 2A and 5A respectively in same direction, the force per unit length acting between the two wires is:

    A) \[2\times {{10}^{-6}}N/m\]                  

    B) \[3\times {{10}^{-6}}N/m\]

    C) \[1\times {{10}^{-6}}N/m\]      

    D) \[4\times {{10}^{-6}}N/m\]

    Correct Answer: C

    Solution :

    (c) Given, \[{{l}_{1}}=2\,\,A,\,\,{{l}_{2}}=5A,\,d=2m\]             \[\therefore \,\,\,\,f=\frac{{{\mu }_{0}}}{4\pi }\frac{2{{l}_{1}}{{l}_{2}}}{d}={{10}^{-7}}\times \frac{2\times 2\times 5}{2}=1\times {{10}^{-6}}N/m\]


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