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AFMC AFMC Solved Paper-2010

  • question_answer
    The magnetic needle of a tangent galvanometer is deflected at an angle 30° due to a magnet. The horizontal component of earth's magnetic field is 0.34 10-4 T along the plane of the coil. The magnetic intensity is

    A) \[1.96\times {{10}^{-4}}T\]                         

    B) \[1.96\times {{10}^{4}}T\]

    C) \[1.96\times {{10}^{-5}}T\]                         

    D) \[~1.96\times {{10}^{5}}T\]

    Correct Answer: C

    Solution :

    According to tangent law \[B=H\tan \theta \] \[B=0.34\times {{10}^{-4}}\tan {{30}^{o}}\] \[=0.34\times {{10}^{-4}}\times \frac{1}{\sqrt{3}}\] \[B=1.96\times {{10}^{-5}}T\]


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