NEET Sample Paper NEET Sample Test Paper-1

  • question_answer If the vertical components of earth's magnetic field be \[6\times {{10}^{-5}}Wb/{{m}^{2}}\] then what will be the induced potential difference produced between the rails of metre gauge when a train is running on them with speed of\[36\text{ }km/hr\]?

    A)  \[9\times {{10}^{4}}\]volt        

    B)  \[6\times {{10}^{-4}}\] volt

    C)  \[3\times {{10}^{-4}}\] volt       

    D)  \[2\times {{10}^{4}}\] volt

    Correct Answer: B

    Solution :

    Vertical component of earth's magnetic field \[B=6\times {{10}^{-5}}Wb/{{m}^{2}}\] distance between the meter gauge rail \[l\]                 =  1 metre speed of train \[V=36\text{ }km/hr.\]                 \[=\frac{36\times 5}{18}=10\,m/s.\] The induced potential difference is given by             \[\varepsilon =B\upsilon l=6\times {{10}^{-5}}\times 10\times 1\] \[=6\times {{10}^{-4}}\] volt


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