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JEE Main & Advanced Physics Magnetism Question Bank Self Evaluation Test - Magnetism and Matter

  • question_answer
    The magnetic needle of a tangent galvanometer is deflected at an angle \[30{}^\circ \] due to a magnet. The horizontal component of earth's magnetic field \[0.34\times {{10}^{-4}}\,T\] is along the plane of the coil. The magnetic intensity is

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

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

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

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

    Correct Answer: B

    Solution :

    [b] We know that \[\frac{B}{{{B}_{^{H}}}}=\tan \theta \] or        \[B={{B}_{H}}=\tan \theta \]    \[=0.34\times {{10}^{-4}}\tan \,30{}^\circ =1.96\times {{10}^{-5}}\,T\]


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